21431213001 has 96 divisors (see below), whose sum is σ = 36652586880. Its totient is φ = 11958399360.

The previous prime is 21431212973. The next prime is 21431213003. The reversal of 21431213001 is 10031213412.

21431213001 is a `hidden beast` number, since 21 + 431 + 213 + 0 + 0 + 1 = 666.

It is not a de Polignac number, because 21431213001 - 2⁵ = 21431212969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21431213003) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 25124091 + ... + 25124943.

It is an arithmetic number, because the mean of its divisors is an integer number (381797780).

Almost surely, 2^21431213001 is an apocalyptic number.

It is an amenable number.

21431213001 is a deficient number, since it is larger than the sum of its proper divisors (15221373879).

21431213001 is a wasteful number, since it uses less digits than its factorization.

21431213001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964 (or 923 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21431213001 its reverse (10031213412), we get a palindrome (31462426413).

It can be divided in two parts, 21431 and 213001, that added together give a palindrome (234432).

The spelling of 21431213001 in words is "twenty-one billion, four hundred thirty-one million, two hundred thirteen thousand, one".