21868740683535 has 32 divisors (see below), whose sum is σ = 36835709160960. Its totient is φ = 11048225205888.

The previous prime is 21868740683533. The next prime is 21868740683609. The reversal of 21868740683535 is 53538604786812.

It is not a de Polignac number, because 21868740683535 - 2¹ = 21868740683533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21868740683533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1779699 + ... + 6848708.

It is an arithmetic number, because the mean of its divisors is an integer number (1151115911280).

Almost surely, 2^{21868740683535} is an apocalyptic number.

21868740683535 is a deficient number, since it is larger than the sum of its proper divisors (14966968477425).

21868740683535 is a wasteful number, since it uses less digits than its factorization.

21868740683535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8637327.

The product of its (nonzero) digits is 232243200, while the sum is 66.

The spelling of 21868740683535 in words is "twenty-one trillion, eight hundred sixty-eight billion, seven hundred forty million, six hundred eighty-three thousand, five hundred thirty-five".