21002122204 has 48 divisors (see below), whose sum is σ = 44264618496. Its totient is φ = 8524296000.

The previous prime is 21002122171. The next prime is 21002122213. The reversal of 21002122204 is 40222120012.

It is a super-4 number, since 4×21002122204⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96402 + ... + 226489.

It is an arithmetic number, because the mean of its divisors is an integer number (922179552).

Almost surely, 2^21002122204 is an apocalyptic number.

It is an amenable number.

21002122204 is an abundant number, since it is smaller than the sum of its proper divisors (23262496292).

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

21002122204 is a wasteful number, since it uses less digits than its factorization.

21002122204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323026 (or 323024 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21002122204 its reverse (40222120012), we get a palindrome (61224242216).

The spelling of 21002122204 in words is "twenty-one billion, two million, one hundred twenty-two thousand, two hundred four".