21623116441 has 4 divisors (see below), whose sum is σ = 21989610000. Its totient is φ = 21256622884.

The previous prime is 21623116433. The next prime is 21623116483. The reversal of 21623116441 is 14461132612.

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 21623116441 - 2³ = 21623116433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21623111441) 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, 183246691 + ... + 183246808.

It is an arithmetic number, because the mean of its divisors is an integer number (5497402500).

Almost surely, 2^21623116441 is an apocalyptic number.

It is an amenable number.

21623116441 is a deficient number, since it is larger than the sum of its proper divisors (366493559).

21623116441 is an equidigital number, since it uses as much as digits as its factorization.

21623116441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366493558.

The product of its digits is 6912, while the sum is 31.

The spelling of 21623116441 in words is "twenty-one billion, six hundred twenty-three million, one hundred sixteen thousand, four hundred forty-one".