21893977040 has 240 divisors, whose sum is σ = 57092345856. Its totient is φ = 7799500800.

The previous prime is 21893977037. The next prime is 21893977057. The reversal of 21893977040 is 4077939812.

It is a self number, because there is not a number n which added to its sum of digits gives 21893977040.

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, 70398485 + ... + 70398795.

Almost surely, 2^21893977040 is an apocalyptic number.

21893977040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21893977040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28546172928).

21893977040 is an abundant number, since it is smaller than the sum of its proper divisors (35198368816).

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

21893977040 is a wasteful number, since it uses less digits than its factorization.

21893977040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 499 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 50.

The spelling of 21893977040 in words is "twenty-one billion, eight hundred ninety-three million, nine hundred seventy-seven thousand, forty".