212121300121 has 4 divisors (see below), whose sum is σ = 212138294544. Its totient is φ = 212104305700.

The previous prime is 212121300103. The next prime is 212121300151. The reversal of 212121300121 is 121003121212.

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.

It is a cyclic number.

It is not a de Polignac number, because 212121300121 - 2⁵ = 212121300089 is a prime.

It is a super-2 number, since 2×212121300121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212121300095 and 212121300104.

It is not an unprimeable number, because it can be changed into a prime (212121300151) 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, 8478475 + ... + 8503456.

It is an arithmetic number, because the mean of its divisors is an integer number (53034573636).

Almost surely, 2^212121300121 is an apocalyptic number.

It is an amenable number.

212121300121 is a deficient number, since it is larger than the sum of its proper divisors (16994423).

212121300121 is a wasteful number, since it uses less digits than its factorization.

212121300121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16994422.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 212121300121 its reverse (121003121212), we get a palindrome (333124421333).

The spelling of 212121300121 in words is "two hundred twelve billion, one hundred twenty-one million, three hundred thousand, one hundred twenty-one".