21030212184 has 16 divisors (see below), whose sum is σ = 52575530520. Its totient is φ = 7010070720.

The previous prime is 21030212179. The next prime is 21030212207. The reversal of 21030212184 is 48121203012.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 876258841 = 21030212184 / (2 + 1 + 0 + 3 + 0 + 2 + 1 + 2 + 1 + 8 + 4).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438129397 + ... + 438129444.

Almost surely, 2^21030212184 is an apocalyptic number.

21030212184 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21030212184 is an abundant number, since it is smaller than the sum of its proper divisors (31545318336).

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

21030212184 is a wasteful number, since it uses less digits than its factorization.

21030212184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876258850 (or 876258846 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 21030212184 its reverse (48121203012), we get a palindrome (69151415196).

The spelling of 21030212184 in words is "twenty-one billion, thirty million, two hundred twelve thousand, one hundred eighty-four".