21725776556340 has 24 divisors (see below), whose sum is σ = 60832174357920. Its totient is φ = 5793540415008.

The previous prime is 21725776556303. The next prime is 21725776556443. The reversal of 21725776556340 is 4365567752712.

It is a Harshad number since it is a multiple of its sum of digits (60), and also a Moran number because the ratio is a prime number: 362096275939 = 21725776556340 / (2 + 1 + 7 + 2 + 5 + 7 + 7 + 6 + 5 + 5 + 6 + 3 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181048137910 + ... + 181048138029.

It is an arithmetic number, because the mean of its divisors is an integer number (2534673931580).

Almost surely, 2^{21725776556340} is an apocalyptic number.

21725776556340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21725776556340 is an abundant number, since it is smaller than the sum of its proper divisors (39106397801580).

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

21725776556340 is a wasteful number, since it uses less digits than its factorization.

21725776556340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362096275951 (or 362096275949 counting only the distinct ones).

The product of its (nonzero) digits is 74088000, while the sum is 60.

The spelling of 21725776556340 in words is "twenty-one trillion, seven hundred twenty-five billion, seven hundred seventy-six million, five hundred fifty-six thousand, three hundred forty".