21506741127552 has 64 divisors (see below), whose sum is σ = 57142346229360. Its totient is φ = 7167023185920.

The previous prime is 21506741127533. The next prime is 21506741127631. The reversal of 21506741127552 is 25572114760512.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 5926449 + ... + 8839472.

Almost surely, 2^{21506741127552} is an apocalyptic number.

It is an amenable number.

21506741127552 is an abundant number, since it is smaller than the sum of its proper divisors (35635605101808).

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

21506741127552 is a wasteful number, since it uses less digits than its factorization.

21506741127552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14769731 (or 14769719 counting only the distinct ones).

The product of its (nonzero) digits is 1176000, while the sum is 48.

The spelling of 21506741127552 in words is "twenty-one trillion, five hundred six billion, seven hundred forty-one million, one hundred twenty-seven thousand, five hundred fifty-two".