21027625205251 has 16 divisors (see below), whose sum is σ = 25438391827200. Its totient is φ = 16997470888608.

The previous prime is 21027625205233. The next prime is 21027625205267. The reversal of 21027625205251 is 15250252672012.

It is not a de Polignac number, because 21027625205251 - 2⁵ = 21027625205219 is a prime.

It is a super-2 number, since 2×21027625205251² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21027625205551) 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, 1204460581 + ... + 1204478038.

It is an arithmetic number, because the mean of its divisors is an integer number (1589899489200).

Almost surely, 2^{21027625205251} is an apocalyptic number.

21027625205251 is a deficient number, since it is larger than the sum of its proper divisors (4410766621949).

21027625205251 is a wasteful number, since it uses less digits than its factorization.

21027625205251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408938698.

The product of its (nonzero) digits is 168000, while the sum is 40.

Adding to 21027625205251 its reverse (15250252672012), we get a palindrome (36277877877263).

The spelling of 21027625205251 in words is "twenty-one trillion, twenty-seven billion, six hundred twenty-five million, two hundred five thousand, two hundred fifty-one".