20021100120202 has 4 divisors (see below), whose sum is σ = 30031650180306. Its totient is φ = 10010550060100.

The previous prime is 20021100120199. The next prime is 20021100120211. The reversal of 20021100120202 is 20202100112002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19458676617601 + 562423502601 = 4411199^2 + 749949^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005275030049 + ... + 5005275030052.

Almost surely, 2^{20021100120202} is an apocalyptic number.

20021100120202 is a deficient number, since it is larger than the sum of its proper divisors (10010550060104).

20021100120202 is a wasteful number, since it uses less digits than its factorization.

20021100120202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10010550060103.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20021100120202 its reverse (20202100112002), we get a palindrome (40223200232204).

The spelling of 20021100120202 in words is "twenty trillion, twenty-one billion, one hundred million, one hundred twenty thousand, two hundred two".