21220221201012 has 48 divisors (see below), whose sum is σ = 55022450071680. Its totient is φ = 7072499124864.

The previous prime is 21220221200897. The next prime is 21220221201013. The reversal of 21220221201012 is 21010212202212.

It is a happy number.

21220221201012 is a `hidden beast` number, since 21 + 220 + 221 + 201 + 0 + 1 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220221201013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11764768 + ... + 13448055.

It is an arithmetic number, because the mean of its divisors is an integer number (1146301043160).

Almost surely, 2^{21220221201012} is an apocalyptic number.

It is an amenable number.

21220221201012 is an abundant number, since it is smaller than the sum of its proper divisors (33802228870668).

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

21220221201012 is a wasteful number, since it uses less digits than its factorization.

21220221201012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25220629 (or 25220621 counting only the distinct ones).

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

Adding to 21220221201012 its reverse (21010212202212), we get a palindrome (42230433403224).

The spelling of 21220221201012 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred one thousand, twelve".