21100970943 has 12 divisors (see below), whose sum is σ = 32823732760. Its totient is φ = 12985212816.

The previous prime is 21100970941. The next prime is 21100971007. The reversal of 21100970943 is 34907900112.

It is not a de Polignac number, because 21100970943 - 2¹ = 21100970941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100970898 and 21100970907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100970941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90174973 + ... + 90175206.

Almost surely, 2^21100970943 is an apocalyptic number.

21100970943 is a deficient number, since it is larger than the sum of its proper divisors (11722761817).

21100970943 is a wasteful number, since it uses less digits than its factorization.

21100970943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180350198 (or 180350195 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The spelling of 21100970943 in words is "twenty-one billion, one hundred million, nine hundred seventy thousand, nine hundred forty-three".