222021212021 has 4 divisors (see below), whose sum is σ = 253738528032. Its totient is φ = 190303896012.

The previous prime is 222021212003. The next prime is 222021212041. The reversal of 222021212021 is 120212120222.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120212120222 = 2 ⋅60106060111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222021212021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222021212041) 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, 15858657995 + ... + 15858658008.

It is an arithmetic number, because the mean of its divisors is an integer number (63434632008).

Almost surely, 2^222021212021 is an apocalyptic number.

It is an amenable number.

222021212021 is a deficient number, since it is larger than the sum of its proper divisors (31717316011).

222021212021 is an equidigital number, since it uses as much as digits as its factorization.

222021212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31717316010.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 222021212021 its reverse (120212120222), we get a palindrome (342233332243).

The spelling of 222021212021 in words is "two hundred twenty-two billion, twenty-one million, two hundred twelve thousand, twenty-one".