21356263477204 has 12 divisors (see below), whose sum is σ = 37373648073300. Its totient is φ = 10678078313408.

The previous prime is 21356263477189. The next prime is 21356263477207. The reversal of 21356263477204 is 40277436265312.

It can be written as a sum of positive squares in 2 ways, for example, as 20835481868100 + 520781609104 = 4564590^2 + 721652^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21356263477207) 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, 12450049 + ... + 14061160.

It is an arithmetic number, because the mean of its divisors is an integer number (3114470672775).

Almost surely, 2^{21356263477204} is an apocalyptic number.

It is an amenable number.

21356263477204 is a deficient number, since it is larger than the sum of its proper divisors (16017384596096).

21356263477204 is a wasteful number, since it uses less digits than its factorization.

21356263477204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26712602 (or 26712600 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 52.

The spelling of 21356263477204 in words is "twenty-one trillion, three hundred fifty-six billion, two hundred sixty-three million, four hundred seventy-seven thousand, two hundred four".