21131654023 has 4 divisors (see below), whose sum is σ = 22243846360. Its totient is φ = 20019461688.

The previous prime is 21131654021. The next prime is 21131654039. The reversal of 21131654023 is 32045613112.

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

It is a cyclic number.

It is not a de Polignac number, because 21131654023 - 2¹ = 21131654021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21131653982 and 21131654000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131654021) 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, 556096140 + ... + 556096177.

It is an arithmetic number, because the mean of its divisors is an integer number (5560961590).

Almost surely, 2^21131654023 is an apocalyptic number.

21131654023 is a deficient number, since it is larger than the sum of its proper divisors (1112192337).

21131654023 is a wasteful number, since it uses less digits than its factorization.

21131654023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112192336.

The product of its (nonzero) digits is 4320, while the sum is 28.

The spelling of 21131654023 in words is "twenty-one billion, one hundred thirty-one million, six hundred fifty-four thousand, twenty-three".