21313123438 has 8 divisors (see below), whose sum is σ = 31981698288. Its totient is φ = 10652557344.

The previous prime is 21313123423. The next prime is 21313123457. The reversal of 21313123438 is 83432131312.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1995531 + ... + 2006182.

It is an arithmetic number, because the mean of its divisors is an integer number (3997712286).

Almost surely, 2^21313123438 is an apocalyptic number.

21313123438 is a deficient number, since it is larger than the sum of its proper divisors (10668574850).

21313123438 is a wasteful number, since it uses less digits than its factorization.

21313123438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004378.

The product of its digits is 10368, while the sum is 31.

The spelling of 21313123438 in words is "twenty-one billion, three hundred thirteen million, one hundred twenty-three thousand, four hundred thirty-eight".