2120212010221 has 4 divisors (see below), whose sum is σ = 2141204208444. Its totient is φ = 2099219812000.

The previous prime is 2120212010209. The next prime is 2120212010233. The reversal of 2120212010221 is 1220102120212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2120212010209) and next prime (2120212010233).

It can be written as a sum of positive squares in 2 ways, for example, as 2090369447721 + 29842562500 = 1445811^2 + 172750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120212010221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120212010195 and 2120212010204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120212010251) 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, 10496098960 + ... + 10496099161.

It is an arithmetic number, because the mean of its divisors is an integer number (535301052111).

Almost surely, 2^{2120212010221} is an apocalyptic number.

It is an amenable number.

2120212010221 is a deficient number, since it is larger than the sum of its proper divisors (20992198223).

2120212010221 is a wasteful number, since it uses less digits than its factorization.

2120212010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20992198222.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2120212010221 its reverse (1220102120212), we get a palindrome (3340314130433).

The spelling of 2120212010221 in words is "two trillion, one hundred twenty billion, two hundred twelve million, ten thousand, two hundred twenty-one".