21002205050 has 24 divisors (see below), whose sum is σ = 40762542816. Its totient is φ = 8035625840.

The previous prime is 21002205013. The next prime is 21002205053. The reversal of 21002205050 is 5050220012.

It is not an unprimeable number, because it can be changed into a prime (21002205053) 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, 9130244 + ... + 9132543.

It is an arithmetic number, because the mean of its divisors is an integer number (1698439284).

Almost surely, 2^21002205050 is an apocalyptic number.

21002205050 is a deficient number, since it is larger than the sum of its proper divisors (19760337766).

21002205050 is a wasteful number, since it uses less digits than its factorization.

21002205050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18262822 (or 18262817 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

Adding to 21002205050 its reverse (5050220012), we get a palindrome (26052425062).

The spelling of 21002205050 in words is "twenty-one billion, two million, two hundred five thousand, fifty".