210211202021121 has 24 divisors (see below), whose sum is σ = 347017545455360. Its totient is φ = 120119915696256.

The previous prime is 210211202021113. The next prime is 210211202021221. The reversal of 210211202021121 is 121120202112012.

210211202021121 is a `hidden beast` number, since 21 + 0 + 211 + 202 + 0 + 211 + 21 = 666.

210211202021121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 210211202021121 - 2³ = 210211202021113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210211202021094 and 210211202021103.

It is not an unprimeable number, because it can be changed into a prime (210211202021221) 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, 746761 + ... + 20517798.

Almost surely, 2^{210211202021121} is an apocalyptic number.

210211202021121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210211202021121 is a deficient number, since it is larger than the sum of its proper divisors (136806343434239).

210211202021121 is a wasteful number, since it uses less digits than its factorization.

210211202021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21421485 (or 21421482 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 210211202021121 its reverse (121120202112012), we get a palindrome (331331404133133).

The spelling of 210211202021121 in words is "two hundred ten trillion, two hundred eleven billion, two hundred two million, twenty-one thousand, one hundred twenty-one".