10207212121 has 4 divisors (see below), whose sum is σ = 10350975744. Its totient is φ = 10063448500.

The previous prime is 10207212109. The next prime is 10207212133. The reversal of 10207212121 is 12121270201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12121270201 = 3889 ⋅3116809.

It is an interprime number because it is at equal distance from previous prime (10207212109) and next prime (10207212133).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10207212121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10207212221) 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, 71881705 + ... + 71881846.

It is an arithmetic number, because the mean of its divisors is an integer number (2587743936).

Almost surely, 2^10207212121 is an apocalyptic number.

It is an amenable number.

10207212121 is a deficient number, since it is larger than the sum of its proper divisors (143763623).

10207212121 is an equidigital number, since it uses as much as digits as its factorization.

10207212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143763622.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 10207212121 its reverse (12121270201), we get a palindrome (22328482322).

The spelling of 10207212121 in words is "ten billion, two hundred seven million, two hundred twelve thousand, one hundred twenty-one".