21220002120204 has 48 divisors (see below), whose sum is σ = 55224002211840. Its totient is φ = 7046439224400.

The previous prime is 21220002120203. The next prime is 21220002120217. The reversal of 21220002120204 is 40202120002212.

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 (21220002120203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373510572 + ... + 373567379.

It is an arithmetic number, because the mean of its divisors is an integer number (1150500046080).

Almost surely, 2^{21220002120204} is an apocalyptic number.

It is an amenable number.

21220002120204 is an abundant number, since it is smaller than the sum of its proper divisors (34004000091636).

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

21220002120204 is a wasteful number, since it uses less digits than its factorization.

21220002120204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747078227 (or 747078219 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21220002120204 its reverse (40202120002212), we get a palindrome (61422122122416).

The spelling of 21220002120204 in words is "twenty-one trillion, two hundred twenty billion, two million, one hundred twenty thousand, two hundred four".