21204422010 has 24 divisors (see below), whose sum is σ = 55131497460. Its totient is φ = 5654512512.

The previous prime is 21204421991. The next prime is 21204422021. The reversal of 21204422010 is 1022440212.

21204422010 is a `hidden beast` number, since 2 + 1 + 20 + 442 + 201 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21089138841 + 115283169 = 145221^2 + 10737^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117802255 + ... + 117802434.

Almost surely, 2^21204422010 is an apocalyptic number.

21204422010 is an abundant number, since it is smaller than the sum of its proper divisors (33927075450).

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

21204422010 is a wasteful number, since it uses less digits than its factorization.

21204422010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235604702 (or 235604699 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21204422010 its reverse (1022440212), we get a palindrome (22226862222).

The spelling of 21204422010 in words is "twenty-one billion, two hundred four million, four hundred twenty-two thousand, ten".