21202948818 has 24 divisors (see below), whose sum is σ = 45955660608. Its totient is φ = 7065197592.

The previous prime is 21202948817. The next prime is 21202948829. The reversal of 21202948818 is 81884920212.

It is not an unprimeable number, because it can be changed into a prime (21202948817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150630 + ... + 255137.

It is an arithmetic number, because the mean of its divisors is an integer number (1914819192).

Almost surely, 2^21202948818 is an apocalyptic number.

21202948818 is an abundant number, since it is smaller than the sum of its proper divisors (24752711790).

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

21202948818 is a wasteful number, since it uses less digits than its factorization.

21202948818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408678 (or 408675 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 45.

The spelling of 21202948818 in words is "twenty-one billion, two hundred two million, nine hundred forty-eight thousand, eight hundred eighteen".