10100212121 has 4 divisors (see below), whose sum is σ = 10100739252. Its totient is φ = 10099684992.

The previous prime is 10100212093. The next prime is 10100212141. The reversal of 10100212121 is 12121200101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12121200101 = 73 ⋅166043837.

It can be written as a sum of positive squares in 2 ways, for example, as 3669936400 + 6430275721 = 60580^2 + 80189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10100212121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10100212141) 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, 233696 + ... + 273521.

It is an arithmetic number, because the mean of its divisors is an integer number (2525184813).

Almost surely, 2^10100212121 is an apocalyptic number.

It is an amenable number.

10100212121 is a deficient number, since it is larger than the sum of its proper divisors (527131).

10100212121 is an equidigital number, since it uses as much as digits as its factorization.

10100212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527130.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 10100212121 its reverse (12121200101), we get a palindrome (22221412222).

The spelling of 10100212121 in words is "ten billion, one hundred million, two hundred twelve thousand, one hundred twenty-one".