21013144231312 has 20 divisors (see below), whose sum is σ = 40717327628236. Its totient is φ = 10505446778880.

The previous prime is 21013144231309. The next prime is 21013144231337. The reversal of 21013144231312 is 21313244131012.

It can be written as a sum of positive squares in 2 ways, for example, as 20605099232656 + 408044998656 = 4539284^2 + 638784^2 .

It is a super-2 number, since 2×21013144231312² (a number of 27 digits) contains 22 as substring.

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, 70179489 + ... + 70478272.

Almost surely, 2^{21013144231312} is an apocalyptic number.

It is an amenable number.

21013144231312 is a deficient number, since it is larger than the sum of its proper divisors (19704183396924).

21013144231312 is a wasteful number, since it uses less digits than its factorization.

21013144231312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140667106 (or 140667100 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 21013144231312 its reverse (21313244131012), we get a palindrome (42326388362324).

The spelling of 21013144231312 in words is "twenty-one trillion, thirteen billion, one hundred forty-four million, two hundred thirty-one thousand, three hundred twelve".