212101201021 has 4 divisors (see below), whose sum is σ = 212119984000. Its totient is φ = 212082418044.

The previous prime is 212101201007. The next prime is 212101201043. The reversal of 212101201021 is 120102101212.

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 212101201021 - 2¹¹ = 212101198973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212101200992 and 212101201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101201061) 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, 9374541 + ... + 9397138.

It is an arithmetic number, because the mean of its divisors is an integer number (53029996000).

Almost surely, 2^212101201021 is an apocalyptic number.

It is an amenable number.

212101201021 is a deficient number, since it is larger than the sum of its proper divisors (18782979).

212101201021 is a wasteful number, since it uses less digits than its factorization.

212101201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18782978.

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

Adding to 212101201021 its reverse (120102101212), we get a palindrome (332203302233).

The spelling of 212101201021 in words is "two hundred twelve billion, one hundred one million, two hundred one thousand, twenty-one".