21141531206164 has 6 divisors (see below), whose sum is σ = 36997679610794. Its totient is φ = 10570765603080.

The previous prime is 21141531206143. The next prime is 21141531206203. The reversal of 21141531206164 is 46160213514112.

It can be written as a sum of positive squares in only one way, i.e., 20596529955600 + 545001250564 = 4538340^2 + 738242^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2642691400767 + ... + 2642691400774.

Almost surely, 2^{21141531206164} is an apocalyptic number.

It is an amenable number.

21141531206164 is a deficient number, since it is larger than the sum of its proper divisors (15856148404630).

21141531206164 is a wasteful number, since it uses less digits than its factorization.

21141531206164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5285382801545 (or 5285382801543 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 21141531206164 in words is "twenty-one trillion, one hundred forty-one billion, five hundred thirty-one million, two hundred six thousand, one hundred sixty-four".