21932952137 has 4 divisors (see below), whose sum is σ = 21934872336. Its totient is φ = 21931031940.

The previous prime is 21932952113. The next prime is 21932952143. The reversal of 21932952137 is 73125923912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21932952137 - 2¹² = 21932948041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21932952037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 942863 + ... + 965844.

It is an arithmetic number, because the mean of its divisors is an integer number (5483718084).

Almost surely, 2^21932952137 is an apocalyptic number.

It is an amenable number.

21932952137 is a deficient number, since it is larger than the sum of its proper divisors (1920199).

21932952137 is a wasteful number, since it uses less digits than its factorization.

21932952137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920198.

The product of its digits is 204120, while the sum is 44.

The spelling of 21932952137 in words is "twenty-one billion, nine hundred thirty-two million, nine hundred fifty-two thousand, one hundred thirty-seven".