21650156001601 has 2 divisors, whose sum is σ = 21650156001602. Its totient is φ = 21650156001600.

The previous prime is 21650156001589. The next prime is 21650156001613. The reversal of 21650156001601 is 10610065105612.

It is a balanced prime because it is at equal distance from previous prime (21650156001589) and next prime (21650156001613).

It can be written as a sum of positive squares in only one way, i.e., 21639057168400 + 11098833201 = 4651780^2 + 105351^2 .

It is a cyclic number.

It is not a de Polignac number, because 21650156001601 - 2¹⁷ = 21650155870529 is a prime.

It is not a weakly prime, because it can be changed into another prime (21650156001101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10825078000800 + 10825078000801.

It is an arithmetic number, because the mean of its divisors is an integer number (10825078000801).

Almost surely, 2^{21650156001601} is an apocalyptic number.

It is an amenable number.

21650156001601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21650156001601 is an equidigital number, since it uses as much as digits as its factorization.

21650156001601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 21650156001601 in words is "twenty-one trillion, six hundred fifty billion, one hundred fifty-six million, one thousand, six hundred one".