20211331232001 has 32 divisors (see below), whose sum is σ = 33363569155840. Its totient is φ = 10660921944192.

The previous prime is 20211331231997. The next prime is 20211331232069. The reversal of 20211331232001 is 10023213311202.

It is not a de Polignac number, because 20211331232001 - 2² = 20211331231997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20211331432001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 218989900 + ... + 219082173.

It is an arithmetic number, because the mean of its divisors is an integer number (1042611536120).

Almost surely, 2^{20211331232001} is an apocalyptic number.

20211331232001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20211331232001 is a deficient number, since it is larger than the sum of its proper divisors (13152237923839).

20211331232001 is an equidigital number, since it uses as much as digits as its factorization.

20211331232001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438072122 (or 438072096 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 20211331232001 its reverse (10023213311202), we get a palindrome (30234544543203).

The spelling of 20211331232001 in words is "twenty trillion, two hundred eleven billion, three hundred thirty-one million, two hundred thirty-two thousand, one".