21162650642552 has 16 divisors (see below), whose sum is σ = 39685777165440. Its totient is φ = 10579776731776.

The previous prime is 21162650642527. The next prime is 21162650642603. The reversal of 21162650642552 is 25524605626112.

It is a junction number, because it is equal to n+sod(n) for n = 21162650642497 and 21162650642506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193515608 + ... + 193624935.

It is an arithmetic number, because the mean of its divisors is an integer number (2480361072840).

Almost surely, 2^{21162650642552} is an apocalyptic number.

It is an amenable number.

21162650642552 is a deficient number, since it is larger than the sum of its proper divisors (18523126522888).

21162650642552 is a wasteful number, since it uses less digits than its factorization.

21162650642552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387147382 (or 387147378 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 47.

The spelling of 21162650642552 in words is "twenty-one trillion, one hundred sixty-two billion, six hundred fifty million, six hundred forty-two thousand, five hundred fifty-two".