21102122120202 has 32 divisors (see below), whose sum is σ = 46945079688960. Its totient is φ = 7026319460160.

The previous prime is 21102122120161. The next prime is 21102122120221. The reversal of 21102122120202 is 20202122120112.

It is a happy number.

21102122120202 is a `hidden beast` number, since 211 + 0 + 212 + 21 + 20 + 202 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214429423 + ... + 214527810.

It is an arithmetic number, because the mean of its divisors is an integer number (1467033740280).

Almost surely, 2^{21102122120202} is an apocalyptic number.

21102122120202 is an abundant number, since it is smaller than the sum of its proper divisors (25842957568758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21102122120202 is a wasteful number, since it uses less digits than its factorization.

21102122120202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428958155 (or 428958149 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21102122120202 its reverse (20202122120112), we get a palindrome (41304244240314).

The spelling of 21102122120202 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-two million, one hundred twenty thousand, two hundred two".