21018520202 has 8 divisors (see below), whose sum is σ = 31551542976. Its totient is φ = 10501339212.

The previous prime is 21018520183. The next prime is 21018520297. The reversal of 21018520202 is 20202581012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3957128 + ... + 3962435.

It is an arithmetic number, because the mean of its divisors is an integer number (3943942872).

Almost surely, 2^21018520202 is an apocalyptic number.

21018520202 is a deficient number, since it is larger than the sum of its proper divisors (10533022774).

21018520202 is a wasteful number, since it uses less digits than its factorization.

21018520202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7920892.

The product of its (nonzero) digits is 640, while the sum is 23.

The spelling of 21018520202 in words is "twenty-one billion, eighteen million, five hundred twenty thousand, two hundred two".