21648208010 has 48 divisors (see below), whose sum is σ = 46125992808. Its totient is φ = 7266526080.

The previous prime is 21648208003. The next prime is 21648208067. The reversal of 21648208010 is 1080284612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17601594241 + 4046613769 = 132671^2 + 63613^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 672389 + ... + 703848.

Almost surely, 2^21648208010 is an apocalyptic number.

21648208010 is an abundant number, since it is smaller than the sum of its proper divisors (24477784798).

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

21648208010 is a wasteful number, since it uses less digits than its factorization.

21648208010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376279 (or 1376268 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The spelling of 21648208010 in words is "twenty-one billion, six hundred forty-eight million, two hundred eight thousand, ten".