21256225552310 has 16 divisors (see below), whose sum is σ = 43727092564896. Its totient is φ = 7287848760768.

The previous prime is 21256225552297. The next prime is 21256225552333. The reversal of 21256225552310 is 1325552265212.

It is a happy number.

It is a super-2 number, since 2×21256225552310² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151830182447 + ... + 151830182586.

It is an arithmetic number, because the mean of its divisors is an integer number (2732943285306).

Almost surely, 2^{21256225552310} is an apocalyptic number.

21256225552310 is an abundant number, since it is smaller than the sum of its proper divisors (22470867012586).

21256225552310 is a wasteful number, since it uses less digits than its factorization.

21256225552310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303660365047.

The product of its (nonzero) digits is 360000, while the sum is 41.

The spelling of 21256225552310 in words is "twenty-one trillion, two hundred fifty-six billion, two hundred twenty-five million, five hundred fifty-two thousand, three hundred ten".