21358127252208 has 40 divisors (see below), whose sum is σ = 55183423888000. Its totient is φ = 7118309709504.

The previous prime is 21358127252191. The next prime is 21358127252213. The reversal of 21358127252208 is 80225272185312.

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, 32989858 + ... + 33631041.

It is an arithmetic number, because the mean of its divisors is an integer number (1379585597200).

Almost surely, 2^{21358127252208} is an apocalyptic number.

It is an amenable number.

21358127252208 is an abundant number, since it is smaller than the sum of its proper divisors (33825296635792).

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

21358127252208 is a wasteful number, since it uses less digits than its factorization.

21358127252208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66627589 (or 66627583 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 48.

The spelling of 21358127252208 in words is "twenty-one trillion, three hundred fifty-eight billion, one hundred twenty-seven million, two hundred fifty-two thousand, two hundred eight".