21001002220202 has 16 divisors (see below), whose sum is σ = 31711884970752. Its totient is φ = 10430381626800.

The previous prime is 21001002220199. The next prime is 21001002220259. The reversal of 21001002220202 is 20202220010012.

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, 3535823 + ... + 7382685.

It is an arithmetic number, because the mean of its divisors is an integer number (1981992810672).

Almost surely, 2^{21001002220202} is an apocalyptic number.

21001002220202 is a deficient number, since it is larger than the sum of its proper divisors (10710882750550).

21001002220202 is a wasteful number, since it uses less digits than its factorization.

21001002220202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3865093.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21001002220202 its reverse (20202220010012), we get a palindrome (41203222230214).

The spelling of 21001002220202 in words is "twenty-one trillion, one billion, two million, two hundred twenty thousand, two hundred two".