21301043231 has 16 divisors (see below), whose sum is σ = 24412316544. Its totient is φ = 18411907584.

The previous prime is 21301043213. The next prime is 21301043233. The reversal of 21301043231 is 13234010312.

It is a cyclic number.

It is not a de Polignac number, because 21301043231 - 2²² = 21296848927 is a prime.

It is a super-2 number, since 2×21301043231² (a number of 21 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 (21301043233) 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, 201095 + ... + 288168.

It is an arithmetic number, because the mean of its divisors is an integer number (1525769784).

Almost surely, 2^21301043231 is an apocalyptic number.

21301043231 is a deficient number, since it is larger than the sum of its proper divisors (3111273313).

21301043231 is a wasteful number, since it uses less digits than its factorization.

21301043231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489490.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21301043231 its reverse (13234010312), we get a palindrome (34535053543).

The spelling of 21301043231 in words is "twenty-one billion, three hundred one million, forty-three thousand, two hundred thirty-one".