21031628204 has 12 divisors (see below), whose sum is σ = 36833911800. Its totient is φ = 10507653408.

The previous prime is 21031628203. The next prime is 21031628227. The reversal of 21031628204 is 40282613012.

It is a happy number.

It is a super-4 number, since 4×21031628204⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21031628203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2034374 + ... + 2044685.

It is an arithmetic number, because the mean of its divisors is an integer number (3069492650).

Almost surely, 2^21031628204 is an apocalyptic number.

It is an amenable number.

21031628204 is a deficient number, since it is larger than the sum of its proper divisors (15802283596).

21031628204 is a wasteful number, since it uses less digits than its factorization.

21031628204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4080352 (or 4080350 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 21031628204 in words is "twenty-one billion, thirty-one million, six hundred twenty-eight thousand, two hundred four".