210120001221121 has 2 divisors, whose sum is σ = 210120001221122. Its totient is φ = 210120001221120.

The previous prime is 210120001221113. The next prime is 210120001221149. The reversal of 210120001221121 is 121122100021012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204330900558096 + 5789100663025 = 14294436^2 + 2406055^2 .

It is a cyclic number.

It is not a de Polignac number, because 210120001221121 - 2³ = 210120001221113 is a prime.

It is a super-2 number, since 2×210120001221121² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210120001221095 and 210120001221104.

It is not a weakly prime, because it can be changed into another prime (210120001221101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060000610560 + 105060000610561.

It is an arithmetic number, because the mean of its divisors is an integer number (105060000610561).

Almost surely, 2^{210120001221121} is an apocalyptic number.

It is an amenable number.

210120001221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210120001221121 is an equidigital number, since it uses as much as digits as its factorization.

210120001221121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 210120001221121 its reverse (121122100021012), we get a palindrome (331242101242133).

The spelling of 210120001221121 in words is "two hundred ten trillion, one hundred twenty billion, one million, two hundred twenty-one thousand, one hundred twenty-one".