21469449648 has 30 divisors (see below), whose sum is σ = 55465367524. Its totient is φ = 7156144832.

The previous prime is 21469449623. The next prime is 21469449671. The reversal of 21469449648 is 84694496412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1004578 + ... + 1025726.

Almost surely, 2^21469449648 is an apocalyptic number.

It is an amenable number.

21469449648 is an abundant number, since it is smaller than the sum of its proper divisors (33995917876).

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

21469449648 is an frugal number, since it uses more digits than its factorization.

21469449648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42309 (or 21154 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 57.

The spelling of 21469449648 in words is "twenty-one billion, four hundred sixty-nine million, four hundred forty-nine thousand, six hundred forty-eight".