21001633053231 has 4 divisors (see below), whose sum is σ = 28002177404312. Its totient is φ = 14001088702152.

The previous prime is 21001633053209. The next prime is 21001633053263. The reversal of 21001633053231 is 13235033610012.

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

It is not a de Polignac number, because 21001633053231 - 2¹³ = 21001633045039 is a prime.

It is a super-2 number, since 2×21001633053231² (a number of 27 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 (21001633053031) 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, 3500272175536 + ... + 3500272175541.

It is an arithmetic number, because the mean of its divisors is an integer number (7000544351078).

Almost surely, 2^{21001633053231} is an apocalyptic number.

21001633053231 is a deficient number, since it is larger than the sum of its proper divisors (7000544351081).

21001633053231 is an equidigital number, since it uses as much as digits as its factorization.

21001633053231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7000544351080.

The product of its (nonzero) digits is 9720, while the sum is 30.

Adding to 21001633053231 its reverse (13235033610012), we get a palindrome (34236666663243).

The spelling of 21001633053231 in words is "twenty-one trillion, one billion, six hundred thirty-three million, fifty-three thousand, two hundred thirty-one".