21455302120 has 64 divisors (see below), whose sum is σ = 56950502400. Its totient is φ = 7118807040.

The previous prime is 21455302109. The next prime is 21455302133. The reversal of 21455302120 is 2120355412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1227225 + ... + 1244584.

It is an arithmetic number, because the mean of its divisors is an integer number (889851600).

Almost surely, 2^21455302120 is an apocalyptic number.

21455302120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21455302120 is an abundant number, since it is smaller than the sum of its proper divisors (35495200280).

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

21455302120 is a wasteful number, since it uses less digits than its factorization.

21455302120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471858 (or 2471854 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21455302120 its reverse (2120355412), we get a palindrome (23575657532).

The spelling of 21455302120 in words is "twenty-one billion, four hundred fifty-five million, three hundred two thousand, one hundred twenty".