21431413211 has 16 divisors (see below), whose sum is σ = 23537352384. Its totient is φ = 19391508864.

The previous prime is 21431413181. The next prime is 21431413217. The reversal of 21431413211 is 11231413412.

It is a de Polignac number, because none of the positive numbers 2^k-21431413211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21431413217) 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, 755690 + ... + 783536.

It is an arithmetic number, because the mean of its divisors is an integer number (1471084524).

Almost surely, 2^21431413211 is an apocalyptic number.

21431413211 is a deficient number, since it is larger than the sum of its proper divisors (2105939173).

21431413211 is a wasteful number, since it uses less digits than its factorization.

21431413211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29030.

The product of its digits is 576, while the sum is 23.

Adding to 21431413211 its reverse (11231413412), we get a palindrome (32662826623).

The spelling of 21431413211 in words is "twenty-one billion, four hundred thirty-one million, four hundred thirteen thousand, two hundred eleven".