21204051030 has 48 divisors (see below), whose sum is σ = 55140269184. Its totient is φ = 5653415040.

The previous prime is 21204050969. The next prime is 21204051047. The reversal of 21204051030 is 3015040212.

21204051030 is a `hidden beast` number, since 2 + 120 + 4 + 0 + 510 + 30 = 666.

It is a super-2 number, since 2×21204051030² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21204050994 and 21204051012.

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 23 ways as a sum of consecutive naturals, for example, 591067 + ... + 625913.

It is an arithmetic number, because the mean of its divisors is an integer number (1148755608).

Almost surely, 2^21204051030 is an apocalyptic number.

21204051030 is an abundant number, since it is smaller than the sum of its proper divisors (33936218154).

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

21204051030 is a wasteful number, since it uses less digits than its factorization.

21204051030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41621 (or 41618 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 21204051030 its reverse (3015040212), we get a palindrome (24219091242).

The spelling of 21204051030 in words is "twenty-one billion, two hundred four million, fifty-one thousand, thirty".