21304412040220 has 12 divisors (see below), whose sum is σ = 44739265284504. Its totient is φ = 8521764816080.

The previous prime is 21304412040151. The next prime is 21304412040283. The reversal of 21304412040220 is 2204021440312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532610300986 + ... + 532610301025.

It is an arithmetic number, because the mean of its divisors is an integer number (3728272107042).

Almost surely, 2^{21304412040220} is an apocalyptic number.

21304412040220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21304412040220 is an abundant number, since it is smaller than the sum of its proper divisors (23434853244284).

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

21304412040220 is a wasteful number, since it uses less digits than its factorization.

21304412040220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065220602020 (or 1065220602018 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21304412040220 its reverse (2204021440312), we get a palindrome (23508433480532).

The spelling of 21304412040220 in words is "twenty-one trillion, three hundred four billion, four hundred twelve million, forty thousand, two hundred twenty".