21459780540675 has 36 divisors (see below), whose sum is σ = 38691400114224. Its totient is φ = 11369420136000.

The previous prime is 21459780540659. The next prime is 21459780540697. The reversal of 21459780540675 is 57604508795412.

It is a happy number.

21459780540675 is a `hidden beast` number, since 2 + 1 + 4 + 5 + 9 + 7 + 80 + 540 + 6 + 7 + 5 = 666.

It is not a de Polignac number, because 21459780540675 - 2⁴ = 21459780540659 is a prime.

It is a Sastry number since concatenated with its successor gives a square.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 315783252 + ... + 315851201.

It is an arithmetic number, because the mean of its divisors is an integer number (1074761114284).

Almost surely, 2^{21459780540675} is an apocalyptic number.

21459780540675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21459780540675 is a deficient number, since it is larger than the sum of its proper divisors (17231619573549).

21459780540675 is a wasteful number, since it uses less digits than its factorization.

21459780540675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631634620 (or 631634612 counting only the distinct ones).

The product of its (nonzero) digits is 84672000, while the sum is 63.

The spelling of 21459780540675 in words is "twenty-one trillion, four hundred fifty-nine billion, seven hundred eighty million, five hundred forty thousand, six hundred seventy-five".