21895856701 has 2 divisors, whose sum is σ = 21895856702. Its totient is φ = 21895856700.

The previous prime is 21895856617. The next prime is 21895856713. The reversal of 21895856701 is 10765859812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16423704025 + 5472152676 = 128155^2 + 73974^2 .

It is a cyclic number.

It is not a de Polignac number, because 21895856701 - 2¹⁵ = 21895823933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21895856501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10947928350 + 10947928351.

It is an arithmetic number, because the mean of its divisors is an integer number (10947928351).

Almost surely, 2^21895856701 is an apocalyptic number.

It is an amenable number.

21895856701 is a deficient number, since it is larger than the sum of its proper divisors (1).

21895856701 is an equidigital number, since it uses as much as digits as its factorization.

21895856701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 52.

The spelling of 21895856701 in words is "twenty-one billion, eight hundred ninety-five million, eight hundred fifty-six thousand, seven hundred one".