21390250379598 has 24 divisors (see below), whose sum is σ = 46349325350328. Its totient is φ = 7129501481232.

The previous prime is 21390250379581. The next prime is 21390250379609. The reversal of 21390250379598 is 89597305209312.

21390250379598 is a `hidden beast` number, since 2 + 1 + 3 + 9 + 0 + 2 + 5 + 0 + 37 + 9 + 598 = 666.

It is a super-2 number, since 2×21390250379598² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48271540 + ... + 48712647.

It is an arithmetic number, because the mean of its divisors is an integer number (1931221889597).

Almost surely, 2^{21390250379598} is an apocalyptic number.

21390250379598 is an abundant number, since it is smaller than the sum of its proper divisors (24959074970730).

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

21390250379598 is a wasteful number, since it uses less digits than its factorization.

21390250379598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96996448 (or 96996445 counting only the distinct ones).

The product of its (nonzero) digits is 36741600, while the sum is 63.

The spelling of 21390250379598 in words is "twenty-one trillion, three hundred ninety billion, two hundred fifty million, three hundred seventy-nine thousand, five hundred ninety-eight".