21498684253785 has 40 divisors (see below), whose sum is σ = 38732042500800. Its totient is φ = 11408346978336.

The previous prime is 21498684253699. The next prime is 21498684253807. The reversal of 21498684253785 is 58735248689412.

21498684253785 is a `hidden beast` number, since 2 + 1 + 4 + 9 + 8 + 6 + 8 + 4 + 2 + 537 + 85 = 666.

It is not a de Polignac number, because 21498684253785 - 2²⁷ = 21498550036057 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 133294207 + ... + 133455396.

It is an arithmetic number, because the mean of its divisors is an integer number (968301062520).

Almost surely, 2^{21498684253785} is an apocalyptic number.

It is an amenable number.

21498684253785 is a deficient number, since it is larger than the sum of its proper divisors (17233358247015).

21498684253785 is a wasteful number, since it uses less digits than its factorization.

21498684253785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266749819 (or 266749810 counting only the distinct ones).

The product of its digits is 928972800, while the sum is 72.

The spelling of 21498684253785 in words is "twenty-one trillion, four hundred ninety-eight billion, six hundred eighty-four million, two hundred fifty-three thousand, seven hundred eighty-five".