21304179460 has 12 divisors (see below), whose sum is σ = 44738776908. Its totient is φ = 8521671776.

The previous prime is 21304179439. The next prime is 21304179473. The reversal of 21304179460 is 6497140312.

It can be written as a sum of positive squares in 2 ways, for example, as 13386027204 + 7918152256 = 115698^2 + 88984^2 .

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, 532604467 + ... + 532604506.

It is an arithmetic number, because the mean of its divisors is an integer number (3728231409).

Almost surely, 2^21304179460 is an apocalyptic number.

21304179460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21304179460 is an abundant number, since it is smaller than the sum of its proper divisors (23434597448).

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

21304179460 is a wasteful number, since it uses less digits than its factorization.

21304179460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065208982 (or 1065208980 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 21304179460 in words is "twenty-one billion, three hundred four million, one hundred seventy-nine thousand, four hundred sixty".