21620536200705 has 32 divisors (see below), whose sum is σ = 37259520359040. Its totient is φ = 10642335321600.

The previous prime is 21620536200661. The next prime is 21620536200793. The reversal of 21620536200705 is 50700263502612.

It is a happy number.

It is not a de Polignac number, because 21620536200705 - 2¹⁴ = 21620536184321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7158271 + ... + 9720180.

It is an arithmetic number, because the mean of its divisors is an integer number (1164360011220).

Almost surely, 2^{21620536200705} is an apocalyptic number.

It is an amenable number.

21620536200705 is a deficient number, since it is larger than the sum of its proper divisors (15638984158335).

21620536200705 is a wasteful number, since it uses less digits than its factorization.

21620536200705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16885041.

The product of its (nonzero) digits is 151200, while the sum is 39.

The spelling of 21620536200705 in words is "twenty-one trillion, six hundred twenty billion, five hundred thirty-six million, two hundred thousand, seven hundred five".