21620536527742 has 8 divisors (see below), whose sum is σ = 32433011163000. Its totient is φ = 10809532806744.

The previous prime is 21620536527683. The next prime is 21620536527757. The reversal of 21620536527742 is 24772563502612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21620536527742.

It is a congruent number.

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, 367691817 + ... + 367750612.

It is an arithmetic number, because the mean of its divisors is an integer number (4054126395375).

Almost surely, 2^{21620536527742} is an apocalyptic number.

21620536527742 is a deficient number, since it is larger than the sum of its proper divisors (10812474635258).

21620536527742 is a wasteful number, since it uses less digits than its factorization.

21620536527742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735457130.

The product of its (nonzero) digits is 8467200, while the sum is 52.

The spelling of 21620536527742 in words is "twenty-one trillion, six hundred twenty billion, five hundred thirty-six million, five hundred twenty-seven thousand, seven hundred forty-two".