21742586040 has 64 divisors (see below), whose sum is σ = 74546012160. Its totient is φ = 4969733760.

The previous prime is 21742586023. The next prime is 21742586051. The reversal of 21742586040 is 4068524712.

It is a self number, because there is not a number n which added to its sum of digits gives 21742586040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12941176 + ... + 12942855.

It is an arithmetic number, because the mean of its divisors is an integer number (1164781440).

Almost surely, 2^21742586040 is an apocalyptic number.

21742586040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21742586040 is an abundant number, since it is smaller than the sum of its proper divisors (52803426120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21742586040 is a wasteful number, since it uses less digits than its factorization.

21742586040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25884052 (or 25884048 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 39.

The spelling of 21742586040 in words is "twenty-one billion, seven hundred forty-two million, five hundred eighty-six thousand, forty".