21633406428311 has 4 divisors (see below), whose sum is σ = 22136508903432. Its totient is φ = 21130303953192.

The previous prime is 21633406428259. The next prime is 21633406428317. The reversal of 21633406428311 is 11382460433612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21633406428311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21633406428317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251551237496 + ... + 251551237581.

It is an arithmetic number, because the mean of its divisors is an integer number (5534127225858).

Almost surely, 2^{21633406428311} is an apocalyptic number.

21633406428311 is a deficient number, since it is larger than the sum of its proper divisors (503102475121).

21633406428311 is an equidigital number, since it uses as much as digits as its factorization.

21633406428311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503102475120.

The product of its (nonzero) digits is 497664, while the sum is 44.

The spelling of 21633406428311 in words is "twenty-one trillion, six hundred thirty-three billion, four hundred six million, four hundred twenty-eight thousand, three hundred eleven".