212120020121 has 4 divisors (see below), whose sum is σ = 212121546000. Its totient is φ = 212118494244.

The previous prime is 212120020067. The next prime is 212120020141. The reversal of 212120020121 is 121020021212.

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 a de Polignac number, because none of the positive numbers 2^k-212120020121 is a prime.

It is a super-2 number, since 2×212120020121² (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 = 212120020096 and 212120020105.

It is not an unprimeable number, because it can be changed into a prime (212120020141) 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, 530891 + ... + 840288.

It is an arithmetic number, because the mean of its divisors is an integer number (53030386500).

Almost surely, 2^212120020121 is an apocalyptic number.

It is an amenable number.

212120020121 is a deficient number, since it is larger than the sum of its proper divisors (1525879).

212120020121 is a wasteful number, since it uses less digits than its factorization.

212120020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525878.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 212120020121 its reverse (121020021212), we get a palindrome (333140041333).

The spelling of 212120020121 in words is "two hundred twelve billion, one hundred twenty million, twenty thousand, one hundred twenty-one".