120021222221 has 4 divisors (see below), whose sum is σ = 120234404352. Its totient is φ = 119808040092.

The previous prime is 120021222193. The next prime is 120021222259. The reversal of 120021222221 is 122222120021.

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.

It is a cyclic number.

It is not a de Polignac number, because 120021222221 - 2¹⁸ = 120020960077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 120021222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120021222421) 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, 106590221 + ... + 106591346.

It is an arithmetic number, because the mean of its divisors is an integer number (30058601088).

Almost surely, 2^120021222221 is an apocalyptic number.

It is an amenable number.

120021222221 is a deficient number, since it is larger than the sum of its proper divisors (213182131).

120021222221 is an equidigital number, since it uses as much as digits as its factorization.

120021222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213182130.

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

Adding to 120021222221 its reverse (122222120021), we get a palindrome (242243342242).

The spelling of 120021222221 in words is "one hundred twenty billion, twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".