21634724322421 has 8 divisors (see below), whose sum is σ = 24725437619904. Its totient is φ = 18544020623520.

The previous prime is 21634724322389. The next prime is 21634724322451. The reversal of 21634724322421 is 12422342743612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21634724322421 - 2⁵ = 21634724322389 is a prime.

It is a super-2 number, since 2×21634724322421² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21634724322451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3348066 + ... + 7380988.

It is an arithmetic number, because the mean of its divisors is an integer number (3090679702488).

Almost surely, 2^{21634724322421} is an apocalyptic number.

It is an amenable number.

21634724322421 is a deficient number, since it is larger than the sum of its proper divisors (3090713297483).

21634724322421 is an equidigital number, since it uses as much as digits as its factorization.

21634724322421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4799291.

The product of its digits is 774144, while the sum is 43.

The spelling of 21634724322421 in words is "twenty-one trillion, six hundred thirty-four billion, seven hundred twenty-four million, three hundred twenty-two thousand, four hundred twenty-one".