21964929111 has 16 divisors (see below), whose sum is σ = 32557010400. Its totient is φ = 14635917504.

The previous prime is 21964929011. The next prime is 21964929187. The reversal of 21964929111 is 11192946912.

It is not a de Polignac number, because 21964929111 - 2¹¹ = 21964927063 is a prime.

It is a super-2 number, since 2×21964929111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21964929191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149766 + ... + 257603.

It is an arithmetic number, because the mean of its divisors is an integer number (2034813150).

Almost surely, 2^21964929111 is an apocalyptic number.

21964929111 is a deficient number, since it is larger than the sum of its proper divisors (10592081289).

21964929111 is a wasteful number, since it uses less digits than its factorization.

21964929111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409375 (or 409369 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The spelling of 21964929111 in words is "twenty-one billion, nine hundred sixty-four million, nine hundred twenty-nine thousand, one hundred eleven".