21478304488 has 16 divisors (see below), whose sum is σ = 40781592000. Its totient is φ = 10603213296.

The previous prime is 21478304473. The next prime is 21478304489. The reversal of 21478304488 is 88440387412.

It is a super-2 number, since 2×21478304488² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21478304489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16991698 + ... + 16992961.

It is an arithmetic number, because the mean of its divisors is an integer number (2548849500).

Almost surely, 2^21478304488 is an apocalyptic number.

It is an amenable number.

21478304488 is a deficient number, since it is larger than the sum of its proper divisors (19303287512).

21478304488 is a wasteful number, since it uses less digits than its factorization.

21478304488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33984744 (or 33984740 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 49.

The spelling of 21478304488 in words is "twenty-one billion, four hundred seventy-eight million, three hundred four thousand, four hundred eighty-eight".