212110220021 has 4 divisors (see below), whose sum is σ = 242411680032. Its totient is φ = 181808760012.

The previous prime is 212110219943. The next prime is 212110220033. The reversal of 212110220021 is 120022011212.

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-212110220021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212110219978 and 212110220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212110220071) 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, 15150729995 + ... + 15150730008.

It is an arithmetic number, because the mean of its divisors is an integer number (60602920008).

Almost surely, 2^212110220021 is an apocalyptic number.

It is an amenable number.

212110220021 is a deficient number, since it is larger than the sum of its proper divisors (30301460011).

212110220021 is an equidigital number, since it uses as much as digits as its factorization.

212110220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30301460010.

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

Adding to 212110220021 its reverse (120022011212), we get a palindrome (332132231233).

The spelling of 212110220021 in words is "two hundred twelve billion, one hundred ten million, two hundred twenty thousand, twenty-one".