23215654781 has 4 divisors (see below), whose sum is σ = 25326168864. Its totient is φ = 21105140700.

The previous prime is 23215654757. The next prime is 23215654793. The reversal of 23215654781 is 18745651232.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23215654781 - 2³⁴ = 6035785597 is a prime.

It is a super-2 number, since 2×23215654781² (a number of 22 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 (23215654741) 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, 1055257025 + ... + 1055257046.

It is an arithmetic number, because the mean of its divisors is an integer number (6331542216).

Almost surely, 2^23215654781 is an apocalyptic number.

It is an amenable number.

23215654781 is a deficient number, since it is larger than the sum of its proper divisors (2110514083).

23215654781 is a wasteful number, since it uses less digits than its factorization.

23215654781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110514082.

The product of its digits is 403200, while the sum is 44.

The spelling of 23215654781 in words is "twenty-three billion, two hundred fifteen million, six hundred fifty-four thousand, seven hundred eighty-one".