210020010121 has 4 divisors (see below), whose sum is σ = 210021722644. Its totient is φ = 210018297600.

The previous prime is 210020010119. The next prime is 210020010149. The reversal of 210020010121 is 121010020012.

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 171627918400 + 38392091721 = 414280^2 + 195939^2 .

It is a cyclic number.

It is not a de Polignac number, because 210020010121 - 2¹ = 210020010119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210020010098 and 210020010107.

It is not an unprimeable number, because it can be changed into a prime (210027010121) 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, 656820 + ... + 922741.

It is an arithmetic number, because the mean of its divisors is an integer number (52505430661).

Almost surely, 2^210020010121 is an apocalyptic number.

It is an amenable number.

210020010121 is a deficient number, since it is larger than the sum of its proper divisors (1712523).

210020010121 is a wasteful number, since it uses less digits than its factorization.

210020010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1712522.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 210020010121 its reverse (121010020012), we get a palindrome (331030030133).

The spelling of 210020010121 in words is "two hundred ten billion, twenty million, ten thousand, one hundred twenty-one".