21088834737 has 4 divisors (see below), whose sum is σ = 28118446320. Its totient is φ = 14059223156.

The previous prime is 21088834733. The next prime is 21088834777. The reversal of 21088834737 is 73743888012.

It is a happy number.

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 21088834737 - 2² = 21088834733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21088834737.

It is not an unprimeable number, because it can be changed into a prime (21088834733) 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, 3514805787 + ... + 3514805792.

It is an arithmetic number, because the mean of its divisors is an integer number (7029611580).

Almost surely, 2^21088834737 is an apocalyptic number.

It is an amenable number.

21088834737 is a deficient number, since it is larger than the sum of its proper divisors (7029611583).

21088834737 is an equidigital number, since it uses as much as digits as its factorization.

21088834737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7029611582.

The product of its (nonzero) digits is 1806336, while the sum is 51.

The spelling of 21088834737 in words is "twenty-one billion, eighty-eight million, eight hundred thirty-four thousand, seven hundred thirty-seven".