21155040202 has 16 divisors (see below), whose sum is σ = 31828567680. Its totient is φ = 10545562192.

The previous prime is 21155040199. The next prime is 21155040217. The reversal of 21155040202 is 20204055112.

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, 1008699 + ... + 1029457.

It is an arithmetic number, because the mean of its divisors is an integer number (1989285480).

Almost surely, 2^21155040202 is an apocalyptic number.

21155040202 is a deficient number, since it is larger than the sum of its proper divisors (10673527478).

21155040202 is a wasteful number, since it uses less digits than its factorization.

21155040202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22277.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 21155040202 its reverse (20204055112), we get a palindrome (41359095314).

The spelling of 21155040202 in words is "twenty-one billion, one hundred fifty-five million, forty thousand, two hundred two".