21120120202 has 16 divisors (see below), whose sum is σ = 32397955560. Its totient is φ = 10322283712.

The previous prime is 21120120163. The next prime is 21120120223. The reversal of 21120120202 is 20202102112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11453494441 + 9666625761 = 107021^2 + 98319^2 .

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, 341833 + ... + 398860.

Almost surely, 2^21120120202 is an apocalyptic number.

21120120202 is a deficient number, since it is larger than the sum of its proper divisors (11277835358).

21120120202 is a wasteful number, since it uses less digits than its factorization.

21120120202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741017.

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

Adding to 21120120202 its reverse (20202102112), we get a palindrome (41322222314).

The spelling of 21120120202 in words is "twenty-one billion, one hundred twenty million, one hundred twenty thousand, two hundred two".