21333001331231 has 16 divisors (see below), whose sum is σ = 22468816920960. Its totient is φ = 20198491296480.

The previous prime is 21333001331141. The next prime is 21333001331261. The reversal of 21333001331231 is 13213310033312.

It is a cyclic number.

It is not a de Polignac number, because 21333001331231 - 2⁴² = 16934954820127 is a prime.

It is a super-2 number, since 2×21333001331231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21333001331231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333001331261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291091565 + ... + 291164841.

It is an arithmetic number, because the mean of its divisors is an integer number (1404301057560).

Almost surely, 2^{21333001331231} is an apocalyptic number.

21333001331231 is a deficient number, since it is larger than the sum of its proper divisors (1135815589729).

21333001331231 is a wasteful number, since it uses less digits than its factorization.

21333001331231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81974.

The product of its (nonzero) digits is 2916, while the sum is 26.

Adding to 21333001331231 its reverse (13213310033312), we get a palindrome (34546311364543).

The spelling of 21333001331231 in words is "twenty-one trillion, three hundred thirty-three billion, one million, three hundred thirty-one thousand, two hundred thirty-one".