21007010671156 has 12 divisors (see below), whose sum is σ = 38924755067268. Its totient is φ = 9885652080512.

The previous prime is 21007010671123. The next prime is 21007010671189. The reversal of 21007010671156 is 65117601070012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21007010671123) and next prime (21007010671189).

It can be written as a sum of positive squares in 2 ways, for example, as 5698055443600 + 15308955227556 = 2387060^2 + 3912666^2 .

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, 154463313691 + ... + 154463313826.

It is an arithmetic number, because the mean of its divisors is an integer number (3243729588939).

Almost surely, 2^{21007010671156} is an apocalyptic number.

It is an amenable number.

21007010671156 is a deficient number, since it is larger than the sum of its proper divisors (17917744396112).

21007010671156 is a wasteful number, since it uses less digits than its factorization.

21007010671156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308926627538 (or 308926627536 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 37.

The spelling of 21007010671156 in words is "twenty-one trillion, seven billion, ten million, six hundred seventy-one thousand, one hundred fifty-six".