21204011120431 has 8 divisors (see below), whose sum is σ = 21224035821744. Its totient is φ = 21183994727040.

The previous prime is 21204011120399. The next prime is 21204011120459. The reversal of 21204011120431 is 13402111040212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21204011120431 - 2⁵ = 21204011120399 is a prime.

It is a super-2 number, since 2×21204011120431² (a number of 27 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 (21204011120531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3035895 + ... + 7185031.

It is an arithmetic number, because the mean of its divisors is an integer number (2653004477718).

Almost surely, 2^{21204011120431} is an apocalyptic number.

21204011120431 is a deficient number, since it is larger than the sum of its proper divisors (20024701313).

21204011120431 is a wasteful number, since it uses less digits than its factorization.

21204011120431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4153961.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21204011120431 its reverse (13402111040212), we get a palindrome (34606122160643).

The spelling of 21204011120431 in words is "twenty-one trillion, two hundred four billion, eleven million, one hundred twenty thousand, four hundred thirty-one".