21931077411 has 12 divisors (see below), whose sum is σ = 31890830400. Its totient is φ = 14522591760.

The previous prime is 21931077367. The next prime is 21931077433. The reversal of 21931077411 is 11477013912.

It is not a de Polignac number, because 21931077411 - 2¹¹ = 21931075363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21931077611) 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, 8175795 + ... + 8178476.

It is an arithmetic number, because the mean of its divisors is an integer number (2657569200).

Almost surely, 2^21931077411 is an apocalyptic number.

21931077411 is a deficient number, since it is larger than the sum of its proper divisors (9959752989).

21931077411 is a wasteful number, since it uses less digits than its factorization.

21931077411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16354426 (or 16354423 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The spelling of 21931077411 in words is "twenty-one billion, nine hundred thirty-one million, seventy-seven thousand, four hundred eleven".