20621122301665 has 16 divisors (see below), whose sum is σ = 25821752364288. Its totient is φ = 15779323048896.

The previous prime is 20621122301651. The next prime is 20621122301707. The reversal of 20621122301665 is 56610322112602.

It is a cyclic number.

It is not a de Polignac number, because 20621122301665 - 2²⁷ = 20620988083937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3996487 + ... + 7564003.

It is an arithmetic number, because the mean of its divisors is an integer number (1613859522768).

Almost surely, 2^{20621122301665} is an apocalyptic number.

It is an amenable number.

20621122301665 is a deficient number, since it is larger than the sum of its proper divisors (5200630062623).

20621122301665 is a wasteful number, since it uses less digits than its factorization.

20621122301665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3617808.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 20621122301665 in words is "twenty trillion, six hundred twenty-one billion, one hundred twenty-two million, three hundred one thousand, six hundred sixty-five".