21437913235 has 4 divisors (see below), whose sum is σ = 25725495888. Its totient is φ = 17150330584.

The previous prime is 21437913187. The next prime is 21437913271. The reversal of 21437913235 is 53231973412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21437913235 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 2143791319 + ... + 2143791328.

It is an arithmetic number, because the mean of its divisors is an integer number (6431373972).

Almost surely, 2^21437913235 is an apocalyptic number.

21437913235 is a deficient number, since it is larger than the sum of its proper divisors (4287582653).

21437913235 is an equidigital number, since it uses as much as digits as its factorization.

21437913235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4287582652.

The product of its digits is 136080, while the sum is 40.

The spelling of 21437913235 in words is "twenty-one billion, four hundred thirty-seven million, nine hundred thirteen thousand, two hundred thirty-five".