21691462317805 has 48 divisors (see below), whose sum is σ = 30486685412736. Its totient is φ = 14772526823040.

The previous prime is 21691462317779. The next prime is 21691462317823. The reversal of 21691462317805 is 50871326419612.

It is not a de Polignac number, because 21691462317805 - 2⁵ = 21691462317773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48096162 + ... + 48545068.

It is an arithmetic number, because the mean of its divisors is an integer number (635139279432).

It is a 1-persistent number, because it is pandigital, but 2⋅21691462317805 = 43382924635610 is not.

Almost surely, 2^{21691462317805} is an apocalyptic number.

It is an amenable number.

21691462317805 is a deficient number, since it is larger than the sum of its proper divisors (8795223094931).

21691462317805 is a wasteful number, since it uses less digits than its factorization.

21691462317805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450274 (or 450267 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 21691462317805 in words is "twenty-one trillion, six hundred ninety-one billion, four hundred sixty-two million, three hundred seventeen thousand, eight hundred five".