21121020212202 has 96 divisors (see below), whose sum is σ = 46609250435280. Its totient is φ = 6911338521600.

The previous prime is 21121020212197. The next prime is 21121020212213. The reversal of 21121020212202 is 20221202012112.

It is a happy number.

21121020212202 is a `hidden beast` number, since 21 + 1 + 210 + 20 + 212 + 202 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 13928652516321 + 7192367695881 = 3732111^2 + 2681859^2 .

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 47 ways as a sum of consecutive naturals, for example, 206424568 + ... + 206526860.

Almost surely, 2^{21121020212202} is an apocalyptic number.

21121020212202 is an abundant number, since it is smaller than the sum of its proper divisors (25488230223078).

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

21121020212202 is a wasteful number, since it uses less digits than its factorization.

21121020212202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103368 (or 103365 counting only the distinct ones).

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

Adding to 21121020212202 its reverse (20221202012112), we get a palindrome (41342222224314).

The spelling of 21121020212202 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, two hundred twelve thousand, two hundred two".