21345513431 has 8 divisors (see below), whose sum is σ = 23337882000. Its totient is φ = 19361789440.

The previous prime is 21345513359. The next prime is 21345513433. The reversal of 21345513431 is 13431554312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21345513431 - 2²² = 21341319127 is a prime.

It is a super-2 number, since 2×21345513431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345513433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2155976 + ... + 2165853.

It is an arithmetic number, because the mean of its divisors is an integer number (2917235250).

Almost surely, 2^21345513431 is an apocalyptic number.

21345513431 is a deficient number, since it is larger than the sum of its proper divisors (1992368569).

21345513431 is a wasteful number, since it uses less digits than its factorization.

21345513431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4322289.

The product of its digits is 21600, while the sum is 32.

The spelling of 21345513431 in words is "twenty-one billion, three hundred forty-five million, five hundred thirteen thousand, four hundred thirty-one".