21222201212010 has 384 divisors, whose sum is σ = 58427736846336. Its totient is φ = 5337506119680.

The previous prime is 21222201211999. The next prime is 21222201212039. The reversal of 21222201212010 is 1021210222212.

It is a happy number.

21222201212010 is a `hidden beast` number, since 2 + 122 + 220 + 121 + 201 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 18406071594 + ... + 18406072746.

It is an arithmetic number, because the mean of its divisors is an integer number (152155564704).

Almost surely, 2^{21222201212010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222201212010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29213868423168).

21222201212010 is an abundant number, since it is smaller than the sum of its proper divisors (37205535634326).

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

21222201212010 is a wasteful number, since it uses less digits than its factorization.

21222201212010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110 (or 2107 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21222201212010 its reverse (1021210222212), we get a palindrome (22243411434222).

The spelling of 21222201212010 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred one million, two hundred twelve thousand, ten".