21002174204 has 24 divisors (see below), whose sum is σ = 42453594288. Its totient is φ = 8984887040.

The previous prime is 21002174203. The next prime is 21002174233. The reversal of 21002174204 is 40247120012.

It is a self number, because there is not a number n which added to its sum of digits gives 21002174204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002174201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14038139 + ... + 14039634.

It is an arithmetic number, because the mean of its divisors is an integer number (1768899762).

Almost surely, 2^21002174204 is an apocalyptic number.

It is an amenable number.

21002174204 is an abundant number, since it is smaller than the sum of its proper divisors (21451420084).

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

21002174204 is a wasteful number, since it uses less digits than its factorization.

21002174204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28077805 (or 28077803 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

Adding to 21002174204 its reverse (40247120012), we get a palindrome (61249294216).

The spelling of 21002174204 in words is "twenty-one billion, two million, one hundred seventy-four thousand, two hundred four".