21431244213412 has 36 divisors (see below), whose sum is σ = 41235113966508. Its totient is φ = 9738883686400.

The previous prime is 21431244213409. The next prime is 21431244213413.

21431244213412 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 5131565967616 + 16299678245796 = 2265296^2 + 4037286^2 .

It is not an unprimeable number, because it can be changed into a prime (21431244213413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4066333 + ... + 7706980.

It is an arithmetic number, because the mean of its divisors is an integer number (1145419832403).

Almost surely, 2^{21431244213412} is an apocalyptic number.

21431244213412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21431244213412 is a deficient number, since it is larger than the sum of its proper divisors (19803869753096).

21431244213412 is a wasteful number, since it uses less digits than its factorization.

21431244213412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11777100 (or 11777087 counting only the distinct ones).

The product of its digits is 36864, while the sum is 34.

It can be divided in two parts, 2143124 and 4213412, that added together give a palindrome (6356536).

The spelling of 21431244213412 in words is "twenty-one trillion, four hundred thirty-one billion, two hundred forty-four million, two hundred thirteen thousand, four hundred twelve".