10210212121 has 4 divisors (see below), whose sum is σ = 10810812852. Its totient is φ = 9609611392.

The previous prime is 10210212041. The next prime is 10210212127. The reversal of 10210212121 is 12121201201.

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 3557526025 + 6652686096 = 59645^2 + 81564^2 .

It is a cyclic number.

It is not a de Polignac number, because 10210212121 - 2⁷ = 10210211993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10210212127) 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, 300300340 + ... + 300300373.

It is an arithmetic number, because the mean of its divisors is an integer number (2702703213).

Almost surely, 2^10210212121 is an apocalyptic number.

It is an amenable number.

10210212121 is a deficient number, since it is larger than the sum of its proper divisors (600600731).

10210212121 is an equidigital number, since it uses as much as digits as its factorization.

10210212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600600730.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 10210212121 its reverse (12121201201), we get a palindrome (22331413322).

The spelling of 10210212121 in words is "ten billion, two hundred ten million, two hundred twelve thousand, one hundred twenty-one".