21771074040 has 64 divisors (see below), whose sum is σ = 65586585600. Its totient is φ = 5781320832.

The previous prime is 21771074023. The next prime is 21771074063. The reversal of 21771074040 is 4047017712.

It is a junction number, because it is equal to n+sod(n) for n = 21771073992 and 21771074010.

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, 350872 + ... + 408231.

It is an arithmetic number, because the mean of its divisors is an integer number (1024790400).

Almost surely, 2^21771074040 is an apocalyptic number.

21771074040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21771074040 is an abundant number, since it is smaller than the sum of its proper divisors (43815511560).

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

21771074040 is a wasteful number, since it uses less digits than its factorization.

21771074040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759356 (or 759352 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 33.

The spelling of 21771074040 in words is "twenty-one billion, seven hundred seventy-one million, seventy-four thousand, forty".