21006298888 has 32 divisors (see below), whose sum is σ = 39600172800. Its totient is φ = 10446403968.

The previous prime is 21006298879. The next prime is 21006298903. The reversal of 21006298888 is 88889260012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1150293 + ... + 1168411.

It is an arithmetic number, because the mean of its divisors is an integer number (1237505400).

Almost surely, 2^21006298888 is an apocalyptic number.

It is an amenable number.

21006298888 is a deficient number, since it is larger than the sum of its proper divisors (18593873912).

21006298888 is a wasteful number, since it uses less digits than its factorization.

21006298888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18901 (or 18897 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 52.

The spelling of 21006298888 in words is "twenty-one billion, six million, two hundred ninety-eight thousand, eight hundred eighty-eight".