21975432111 has 12 divisors (see below), whose sum is σ = 32917931592. Its totient is φ = 14650287912.

The previous prime is 21975432107. The next prime is 21975432187. The reversal of 21975432111 is 11123457912.

It is a happy number.

21975432111 is a `hidden beast` number, since 2 + 1 + 97 + 543 + 21 + 1 + 1 = 666.

It is not a de Polignac number, because 21975432111 - 2² = 21975432107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21975433111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45216696 + ... + 45217181.

It is an arithmetic number, because the mean of its divisors is an integer number (2743160966).

Almost surely, 2^21975432111 is an apocalyptic number.

21975432111 is a deficient number, since it is larger than the sum of its proper divisors (10942499481).

21975432111 is an frugal number, since it uses more digits than its factorization.

21975432111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90433892 (or 90433880 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The spelling of 21975432111 in words is "twenty-one billion, nine hundred seventy-five million, four hundred thirty-two thousand, one hundred eleven".