21534070313 has 4 divisors (see below), whose sum is σ = 24610366080. Its totient is φ = 18457774548.

The previous prime is 21534070303. The next prime is 21534070331. The reversal of 21534070313 is 31307043512.

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 21534070313 - 2⁴ = 21534070297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21534070303) 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, 1538147873 + ... + 1538147886.

It is an arithmetic number, because the mean of its divisors is an integer number (6152591520).

Almost surely, 2^21534070313 is an apocalyptic number.

It is an amenable number.

21534070313 is a deficient number, since it is larger than the sum of its proper divisors (3076295767).

21534070313 is an equidigital number, since it uses as much as digits as its factorization.

21534070313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3076295766.

The product of its (nonzero) digits is 7560, while the sum is 29.

The spelling of 21534070313 in words is "twenty-one billion, five hundred thirty-four million, seventy thousand, three hundred thirteen".