21404302120 has 32 divisors (see below), whose sum is σ = 48163991400. Its totient is φ = 8560954368.

The previous prime is 21404302097. The next prime is 21404302141. The reversal of 21404302120 is 2120340412.

It can be written as a sum of positive squares in 4 ways, for example, as 20455292484 + 949009636 = 143022^2 + 30806^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 694396 + ... + 724564.

Almost surely, 2^21404302120 is an apocalyptic number.

21404302120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21404302120 is an abundant number, since it is smaller than the sum of its proper divisors (26759689280).

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

21404302120 is a wasteful number, since it uses less digits than its factorization.

21404302120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47917 (or 47913 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21404302120 its reverse (2120340412), we get a palindrome (23524642532).

The spelling of 21404302120 in words is "twenty-one billion, four hundred four million, three hundred two thousand, one hundred twenty".