210073121 has 4 divisors (see below), whose sum is σ = 210128772. Its totient is φ = 210017472.

The previous prime is 210073111. The next prime is 210073133. The reversal of 210073121 is 121370012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61842496 + 148230625 = 7864^2 + 12175^2 .

It is a cyclic number.

It is not a de Polignac number, because 210073121 - 2²² = 205878817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210073121.

It is not an unprimeable number, because it can be changed into a prime (210073111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21716 + ... + 29861.

It is an arithmetic number, because the mean of its divisors is an integer number (52532193).

Almost surely, 2^210073121 is an apocalyptic number.

It is an amenable number.

210073121 is a deficient number, since it is larger than the sum of its proper divisors (55651).

210073121 is an equidigital number, since it uses as much as digits as its factorization.

210073121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55650.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 210073121 is about 14493.8994407992. The cubic root of 210073121 is about 594.4611754481.

The spelling of 210073121 in words is "two hundred ten million, seventy-three thousand, one hundred twenty-one".