21311340716 has 12 divisors (see below), whose sum is σ = 37300694088. Its totient is φ = 10653999552.

The previous prime is 21311340691. The next prime is 21311340719. The reversal of 21311340716 is 61704311312.

It is a super-2 number, since 2×21311340716² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21311340719) 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, 388781 + ... + 440196.

It is an arithmetic number, because the mean of its divisors is an integer number (3108391174).

Almost surely, 2^21311340716 is an apocalyptic number.

It is an amenable number.

21311340716 is a deficient number, since it is larger than the sum of its proper divisors (15989353372).

21311340716 is a wasteful number, since it uses less digits than its factorization.

21311340716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835408 (or 835406 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The spelling of 21311340716 in words is "twenty-one billion, three hundred eleven million, three hundred forty thousand, seven hundred sixteen".