21477372057446 has 16 divisors (see below), whose sum is σ = 33258543556608. Its totient is φ = 10391258742600.

The previous prime is 21477372057433. The next prime is 21477372057451. The reversal of 21477372057446 is 64475027377412.

It is a super-2 number, since 2×21477372057446² (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, 16329470 + ... + 17595633.

It is an arithmetic number, because the mean of its divisors is an integer number (2078658972288).

Almost surely, 2^{21477372057446} is an apocalyptic number.

21477372057446 is a deficient number, since it is larger than the sum of its proper divisors (11781171499162).

21477372057446 is a wasteful number, since it uses less digits than its factorization.

21477372057446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33935347.

The product of its (nonzero) digits is 55319040, while the sum is 59.

The spelling of 21477372057446 in words is "twenty-one trillion, four hundred seventy-seven billion, three hundred seventy-two million, fifty-seven thousand, four hundred forty-six".