21464501137 has 4 divisors (see below), whose sum is σ = 21508576576. Its totient is φ = 21420425700.

The previous prime is 21464501131. The next prime is 21464501141. The reversal of 21464501137 is 73110546412.

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 21464501137 - 2²⁷ = 21330283409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21464501131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22036989 + ... + 22037962.

It is an arithmetic number, because the mean of its divisors is an integer number (5377144144).

Almost surely, 2^21464501137 is an apocalyptic number.

It is an amenable number.

21464501137 is a deficient number, since it is larger than the sum of its proper divisors (44075439).

21464501137 is an equidigital number, since it uses as much as digits as its factorization.

21464501137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44075438.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 21464501137 in words is "twenty-one billion, four hundred sixty-four million, five hundred one thousand, one hundred thirty-seven".