23748891421 has 4 divisors (see below), whose sum is σ = 25145885052. Its totient is φ = 22351897792.

The previous prime is 23748891349. The next prime is 23748891427. The reversal of 23748891421 is 12419884732.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19540125796 + 4208765625 = 139786^2 + 64875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23748891421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23748891427) 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, 698496790 + ... + 698496823.

It is an arithmetic number, because the mean of its divisors is an integer number (6286471263).

Almost surely, 2^23748891421 is an apocalyptic number.

It is an amenable number.

23748891421 is a deficient number, since it is larger than the sum of its proper divisors (1396993631).

23748891421 is a wasteful number, since it uses less digits than its factorization.

23748891421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396993630.

The product of its digits is 774144, while the sum is 49.

The spelling of 23748891421 in words is "twenty-three billion, seven hundred forty-eight million, eight hundred ninety-one thousand, four hundred twenty-one".