21319739543624 has 32 divisors (see below), whose sum is σ = 40335608872440. Its totient is φ = 10563611520000.

The previous prime is 21319739543621. The next prime is 21319739543671. The reversal of 21319739543624 is 42634593791312.

It can be written as a sum of positive squares in 4 ways, for example, as 20893291362724 + 426448180900 = 4570918^2 + 653030^2 .

It is not an unprimeable number, because it can be changed into a prime (21319739543621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2829314 + ... + 7116494.

Almost surely, 2^{21319739543624} is an apocalyptic number.

It is an amenable number.

21319739543624 is a deficient number, since it is larger than the sum of its proper divisors (19015869328816).

21319739543624 is a wasteful number, since it uses less digits than its factorization.

21319739543624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4292801 (or 4292797 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 59.

The spelling of 21319739543624 in words is "twenty-one trillion, three hundred nineteen billion, seven hundred thirty-nine million, five hundred forty-three thousand, six hundred twenty-four".