21009125358 has 56 divisors (see below), whose sum is σ = 50883495768. Its totient is φ = 6464340432.

The previous prime is 21009125339. The next prime is 21009125377. The reversal of 21009125358 is 85352190012.

21009125358 is a `hidden beast` number, since 2 + 100 + 9 + 12 + 535 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (21009125339) and next prime (21009125377).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 535260 + ... + 573167.

It is an arithmetic number, because the mean of its divisors is an integer number (908633853).

Almost surely, 2^21009125358 is an apocalyptic number.

21009125358 is an abundant number, since it is smaller than the sum of its proper divisors (29874370410).

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

21009125358 is a wasteful number, since it uses less digits than its factorization.

21009125358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108460 (or 1108445 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 21009125358 in words is "twenty-one billion, nine million, one hundred twenty-five thousand, three hundred fifty-eight".