21365626706641 has 16 divisors (see below), whose sum is σ = 24493054537728. Its totient is φ = 18257042433600.

The previous prime is 21365626706597. The next prime is 21365626706663. The reversal of 21365626706641 is 14660762656312.

It is a cyclic number.

It is not a de Polignac number, because 21365626706641 - 2³⁹ = 20815870892753 is a prime.

It is a super-2 number, since 2×21365626706641² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21365626766641) by changing a digit.

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, 3878911 + ... + 7601131.

It is an arithmetic number, because the mean of its divisors is an integer number (1530815908608).

Almost surely, 2^{21365626706641} is an apocalyptic number.

It is an amenable number.

21365626706641 is a deficient number, since it is larger than the sum of its proper divisors (3127427831087).

21365626706641 is a wasteful number, since it uses less digits than its factorization.

21365626706641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3724752.

The product of its (nonzero) digits is 13063680, while the sum is 55.

The spelling of 21365626706641 in words is "twenty-one trillion, three hundred sixty-five billion, six hundred twenty-six million, seven hundred six thousand, six hundred forty-one".