21220060050 has 378 divisors, whose sum is σ = 69475770063. Its totient is φ = 4805801280.

The previous prime is 21220060007. The next prime is 21220060051. The reversal of 21220060050 is 5006002212.

21220060050 is a `hidden beast` number, since 2 + 12 + 2 + 0 + 0 + 600 + 50 = 666.

21220060050 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 5 ways, for example, as 11892556809 + 9327503241 = 109053^2 + 96579^2 .

It is a tau number, because it is divible by the number of its divisors (378).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=103005.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21220060051) by changing a digit.

It is a polite number, since it can be written in 188 ways as a sum of consecutive naturals, for example, 194679396 + ... + 194679504.

Almost surely, 2^21220060050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220060050

21220060050 is an abundant number, since it is smaller than the sum of its proper divisors (48255710013).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21220060050 is an equidigital number, since it uses as much as digits as its factorization.

21220060050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Multiplying 21220060050 by its sum of digits (18), we get a square (381961080900 = 618030²).

21220060050 divided by its sum of digits (18) gives a square (1178892225 = 34335²).

Adding to 21220060050 its reverse (5006002212), we get a palindrome (26226062262).

The spelling of 21220060050 in words is "twenty-one billion, two hundred twenty million, sixty thousand, fifty".