210202021220121 has 24 divisors (see below), whose sum is σ = 347001074634240. Its totient is φ = 120115124790336.

The previous prime is 210202021220111. The next prime is 210202021220143. The reversal of 210202021220121 is 121022120202012.

It is a happy number.

210202021220121 is a `hidden beast` number, since 210 + 2 + 0 + 20 + 212 + 201 + 21 = 666.

It is not a de Polignac number, because 210202021220121 - 2²² = 210202017025817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210202021220094 and 210202021220103.

It is not an unprimeable number, because it can be changed into a prime (210202021220111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20904645 + ... + 29281533.

It is an arithmetic number, because the mean of its divisors is an integer number (14458378109760).

Almost surely, 2^{210202021220121} is an apocalyptic number.

210202021220121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210202021220121 is a deficient number, since it is larger than the sum of its proper divisors (136799053414119).

210202021220121 is a wasteful number, since it uses less digits than its factorization.

210202021220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8775205 (or 8775202 counting only the distinct ones).

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

Adding to 210202021220121 its reverse (121022120202012), we get a palindrome (331224141422133).

The spelling of 210202021220121 in words is "two hundred ten trillion, two hundred two billion, twenty-one million, two hundred twenty thousand, one hundred twenty-one".