21168853180 has 24 divisors (see below), whose sum is σ = 45183358080. Its totient is φ = 8328728640.

The previous prime is 21168853159. The next prime is 21168853201. The reversal of 21168853180 is 8135886112.

It is an interprime number because it is at equal distance from previous prime (21168853159) and next prime (21168853201).

It is a super-2 number, since 2×21168853180² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8674540 + ... + 8676979.

It is an arithmetic number, because the mean of its divisors is an integer number (1882639920).

Almost surely, 2^21168853180 is an apocalyptic number.

21168853180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21168853180 is an abundant number, since it is smaller than the sum of its proper divisors (24014504900).

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

21168853180 is a wasteful number, since it uses less digits than its factorization.

21168853180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17351589 (or 17351587 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 43.

The spelling of 21168853180 in words is "twenty-one billion, one hundred sixty-eight million, eight hundred fifty-three thousand, one hundred eighty".