21290680204 has 48 divisors (see below), whose sum is σ = 41017536000. Its totient is φ = 9624738816.

The previous prime is 21290680189. The next prime is 21290680207. The reversal of 21290680204 is 40208609212.

It is a self number, because there is not a number n which added to its sum of digits gives 21290680204.

It is not an unprimeable number, because it can be changed into a prime (21290680207) 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, 771289 + ... + 798415.

It is an arithmetic number, because the mean of its divisors is an integer number (854532000).

Almost surely, 2^21290680204 is an apocalyptic number.

It is an amenable number.

21290680204 is a deficient number, since it is larger than the sum of its proper divisors (19726855796).

21290680204 is a wasteful number, since it uses less digits than its factorization.

21290680204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27622 (or 27620 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The spelling of 21290680204 in words is "twenty-one billion, two hundred ninety million, six hundred eighty thousand, two hundred four".