210700121 has 2 divisors, whose sum is σ = 210700122. Its totient is φ = 210700120.

The previous prime is 210700111. The next prime is 210700153. The reversal of 210700121 is 121007012.

210700121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111598096 + 99102025 = 10564^2 + 9955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210700121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210700096 and 210700105.

It is not a weakly prime, because it can be changed into another prime (210700111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105350060 + 105350061.

It is an arithmetic number, because the mean of its divisors is an integer number (105350061).

Almost surely, 2^210700121 is an apocalyptic number.

It is an amenable number.

210700121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210700121 is an equidigital number, since it uses as much as digits as its factorization.

210700121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 210700121 is about 14515.5131152846. The cubic root of 210700121 is about 595.0520124953.

Adding to 210700121 its reverse (121007012), we get a palindrome (331707133).

The spelling of 210700121 in words is "two hundred ten million, seven hundred thousand, one hundred twenty-one".