21001330132231 has 4 divisors (see below), whose sum is σ = 21914431442352. Its totient is φ = 20088228822112.

The previous prime is 21001330132201. The next prime is 21001330132273. The reversal of 21001330132231 is 13223103310012.

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

It is a cyclic number.

It is not a de Polignac number, because 21001330132231 - 2³¹ = 20999182648583 is a prime.

It is a super-2 number, since 2×21001330132231² (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 (21001330132201) 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, 456550655026 + ... + 456550655071.

It is an arithmetic number, because the mean of its divisors is an integer number (5478607860588).

Almost surely, 2^{21001330132231} is an apocalyptic number.

21001330132231 is a deficient number, since it is larger than the sum of its proper divisors (913101310121).

21001330132231 is an equidigital number, since it uses as much as digits as its factorization.

21001330132231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913101310120.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21001330132231 its reverse (13223103310012), we get a palindrome (34224433442243).

The spelling of 21001330132231 in words is "twenty-one trillion, one billion, three hundred thirty million, one hundred thirty-two thousand, two hundred thirty-one".