21431044013412 has 24 divisors (see below), whose sum is σ = 54551748398112. Its totient is φ = 6494255761600.

The previous prime is 21431044013377. The next prime is 21431044013413.

It is a happy number.

21431044013412 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 21431044013412.

It is not an unprimeable number, because it can be changed into a prime (21431044013413) 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, 81178196889 + ... + 81178197152.

It is an arithmetic number, because the mean of its divisors is an integer number (2272989516588).

Almost surely, 2^{21431044013412} is an apocalyptic number.

21431044013412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21431044013412 is an abundant number, since it is smaller than the sum of its proper divisors (33120704384700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21431044013412 is a wasteful number, since it uses less digits than its factorization.

21431044013412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162356394059 (or 162356394057 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

It can be divided in two parts, 2143104 and 4013412, that added together give a palindrome (6156516).

The spelling of 21431044013412 in words is "twenty-one trillion, four hundred thirty-one billion, forty-four million, thirteen thousand, four hundred twelve".