21654046031 has 4 divisors (see below), whose sum is σ = 21654522672. Its totient is φ = 21653569392.

The previous prime is 21654045977. The next prime is 21654046033. The reversal of 21654046031 is 13064045612.

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 21654046031 - 2¹⁴ = 21654029647 is a prime.

It is a super-2 number, since 2×21654046031² (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 (21654046033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162035 + ... + 263748.

It is an arithmetic number, because the mean of its divisors is an integer number (5413630668).

Almost surely, 2^21654046031 is an apocalyptic number.

21654046031 is a deficient number, since it is larger than the sum of its proper divisors (476641).

21654046031 is an equidigital number, since it uses as much as digits as its factorization.

21654046031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476640.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 21654046031 in words is "twenty-one billion, six hundred fifty-four million, forty-six thousand, thirty-one".