210021020222121 has 16 divisors (see below), whose sum is σ = 311180378013120. Its totient is φ = 139996856856960.

The previous prime is 210021020222063. The next prime is 210021020222129. The reversal of 210021020222121 is 121222020120012.

It is a happy number.

210021020222121 is a `hidden beast` number, since 2 + 10 + 0 + 210 + 202 + 221 + 21 = 666.

It is not a de Polignac number, because 210021020222121 - 2⁷ = 210021020221993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210021020222094 and 210021020222103.

It is not an unprimeable number, because it can be changed into a prime (210021020222129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 476348475 + ... + 476789168.

It is an arithmetic number, because the mean of its divisors is an integer number (19448773625820).

Almost surely, 2^{210021020222121} is an apocalyptic number.

It is an amenable number.

210021020222121 is a deficient number, since it is larger than the sum of its proper divisors (101159357790999).

210021020222121 is an equidigital number, since it uses as much as digits as its factorization.

210021020222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953145813 (or 953145807 counting only the distinct ones).

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

Adding to 210021020222121 its reverse (121222020120012), we get a palindrome (331243040342133).

The spelling of 210021020222121 in words is "two hundred ten trillion, twenty-one billion, twenty million, two hundred twenty-two thousand, one hundred twenty-one".