20621122301651 has 2 divisors, whose sum is σ = 20621122301652. Its totient is φ = 20621122301650.

The previous prime is 20621122301603. The next prime is 20621122301707. The reversal of 20621122301651 is 15610322112602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20621122301651 is a prime.

It is not a weakly prime, because it can be changed into another prime (20621122001651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310561150825 + 10310561150826.

It is an arithmetic number, because the mean of its divisors is an integer number (10310561150826).

Almost surely, 2^{20621122301651} is an apocalyptic number.

20621122301651 is a deficient number, since it is larger than the sum of its proper divisors (1).

20621122301651 is an equidigital number, since it uses as much as digits as its factorization.

20621122301651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 20621122301651 in words is "twenty trillion, six hundred twenty-one billion, one hundred twenty-two million, three hundred one thousand, six hundred fifty-one".