21431000042245 has 16 divisors (see below), whose sum is σ = 26168262588288. Its totient is φ = 16844725419840.

The previous prime is 21431000042183. The next prime is 21431000042299. The reversal of 21431000042245 is 54224000013412.

It is not a de Polignac number, because 21431000042245 - 2¹³ = 21431000034053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39338019 + ... + 39879088.

It is an arithmetic number, because the mean of its divisors is an integer number (1635516411768).

Almost surely, 2^{21431000042245} is an apocalyptic number.

It is an amenable number.

21431000042245 is a deficient number, since it is larger than the sum of its proper divisors (4737262546043).

21431000042245 is an equidigital number, since it uses as much as digits as its factorization.

21431000042245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79218060.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 21431000042245 its reverse (54224000013412), we get a palindrome (75655000055657).

The spelling of 21431000042245 in words is "twenty-one trillion, four hundred thirty-one billion, forty-two thousand, two hundred forty-five".