21120202121202 has 48 divisors (see below), whose sum is σ = 47793769433280. Its totient is φ = 6733697044896.

The previous prime is 21120202121159. The next prime is 21120202121219. The reversal of 21120202121202 is 20212120202112.

It is a happy number.

21120202121202 is a `hidden beast` number, since 21 + 120 + 202 + 121 + 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 23 ways as a sum of consecutive naturals, for example, 268706598 + ... + 268785185.

It is an arithmetic number, because the mean of its divisors is an integer number (995703529860).

Almost surely, 2^{21120202121202} is an apocalyptic number.

21120202121202 is an abundant number, since it is smaller than the sum of its proper divisors (26673567312078).

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

21120202121202 is a wasteful number, since it uses less digits than its factorization.

21120202121202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537491887 (or 537491884 counting only the distinct ones).

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

Adding to 21120202121202 its reverse (20212120202112), we get a palindrome (41332322323314).

The spelling of 21120202121202 in words is "twenty-one trillion, one hundred twenty billion, two hundred two million, one hundred twenty-one thousand, two hundred two".