21166582040 has 64 divisors (see below), whose sum is σ = 48042408960. Its totient is φ = 8392636800.

The previous prime is 21166582013. The next prime is 21166582049. The reversal of 21166582040 is 4028566112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21166582049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3034637 + ... + 3041603.

It is an arithmetic number, because the mean of its divisors is an integer number (750662640).

Almost surely, 2^21166582040 is an apocalyptic number.

21166582040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21166582040 is an abundant number, since it is smaller than the sum of its proper divisors (26875826920).

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

21166582040 is a wasteful number, since it uses less digits than its factorization.

21166582040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7632 (or 7628 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 21166582040 in words is "twenty-one billion, one hundred sixty-six million, five hundred eighty-two thousand, forty".