212011202021 has 4 divisors (see below), whose sum is σ = 213992615232. Its totient is φ = 210029788812.

The previous prime is 212011201937. The next prime is 212011202041. The reversal of 212011202021 is 120202110212.

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-212011202021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212011201987 and 212011202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212011202041) 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, 990706445 + ... + 990706658.

It is an arithmetic number, because the mean of its divisors is an integer number (53498153808).

Almost surely, 2^212011202021 is an apocalyptic number.

It is an amenable number.

212011202021 is a deficient number, since it is larger than the sum of its proper divisors (1981413211).

212011202021 is a wasteful number, since it uses less digits than its factorization.

212011202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981413210.

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

Adding to 212011202021 its reverse (120202110212), we get a palindrome (332213312233).

The spelling of 212011202021 in words is "two hundred twelve billion, eleven million, two hundred two thousand, twenty-one".