21231320200124 has 12 divisors (see below), whose sum is σ = 37537849632864. Its totient is φ = 10506220305024.

The previous prime is 21231320200117. The next prime is 21231320200157. The reversal of 21231320200124 is 42100202313212.

It is a self number, because there is not a number n which added to its sum of digits gives 21231320200124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27359948324 + ... + 27359949099.

It is an arithmetic number, because the mean of its divisors is an integer number (3128154136072).

Almost surely, 2^{21231320200124} is an apocalyptic number.

It is an amenable number.

21231320200124 is a deficient number, since it is larger than the sum of its proper divisors (16306529432740).

21231320200124 is a wasteful number, since it uses less digits than its factorization.

21231320200124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54719897524 (or 54719897522 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21231320200124 its reverse (42100202313212), we get a palindrome (63331522513336).

The spelling of 21231320200124 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred twenty million, two hundred thousand, one hundred twenty-four".