21853392930 has 24 divisors (see below), whose sum is σ = 56818821852. Its totient is φ = 5827571424.

The previous prime is 21853392907. The next prime is 21853392941. The reversal of 21853392930 is 3929335812.

21853392930 is a `hidden beast` number, since 21 + 8 + 5 + 339 + 293 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17998100649 + 3855292281 = 134157^2 + 62091^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121407649 + ... + 121407828.

Almost surely, 2^21853392930 is an apocalyptic number.

21853392930 is an abundant number, since it is smaller than the sum of its proper divisors (34965428922).

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

21853392930 is a wasteful number, since it uses less digits than its factorization.

21853392930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242815490 (or 242815487 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The spelling of 21853392930 in words is "twenty-one billion, eight hundred fifty-three million, three hundred ninety-two thousand, nine hundred thirty".