21251054305522 has 4 divisors (see below), whose sum is σ = 31876581458286. Its totient is φ = 10625527152760.

The previous prime is 21251054305493. The next prime is 21251054305531. The reversal of 21251054305522 is 22550345015212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19448884987921 + 1802169317601 = 4410089^2 + 1342449^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5312763576379 + ... + 5312763576382.

Almost surely, 2^{21251054305522} is an apocalyptic number.

21251054305522 is a deficient number, since it is larger than the sum of its proper divisors (10625527152764).

21251054305522 is a wasteful number, since it uses less digits than its factorization.

21251054305522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10625527152763.

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 21251054305522 in words is "twenty-one trillion, two hundred fifty-one billion, fifty-four million, three hundred five thousand, five hundred twenty-two".