21343712523 has 32 divisors (see below), whose sum is σ = 35108121600. Its totient is φ = 11263840896.

The previous prime is 21343712519. The next prime is 21343712527. The reversal of 21343712523 is 32521734312.

It is an interprime number because it is at equal distance from previous prime (21343712519) and next prime (21343712527).

It is not a de Polignac number, because 21343712523 - 2² = 21343712519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21343712527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 747888 + ... + 775901.

It is an arithmetic number, because the mean of its divisors is an integer number (1097128800).

Almost surely, 2^21343712523 is an apocalyptic number.

21343712523 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21343712523 is a deficient number, since it is larger than the sum of its proper divisors (13764409077).

21343712523 is a wasteful number, since it uses less digits than its factorization.

21343712523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523851.

The product of its digits is 30240, while the sum is 33.

It can be divided in two parts, 21343 and 712523, that added together give a triangular number (733866 = T₁₂₁₁).

The spelling of 21343712523 in words is "twenty-one billion, three hundred forty-three million, seven hundred twelve thousand, five hundred twenty-three".