122212220202221 has 4 divisors (see below), whose sum is σ = 122212303009500. Its totient is φ = 122212137394944.

The previous prime is 122212220202041. The next prime is 122212220202227. The reversal of 122212220202221 is 122202022212221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 94054869879721 + 28157350322500 = 9698189^2 + 5306350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122212220202221 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 (122212220202227) 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, 39148916 + ... + 42155213.

It is an arithmetic number, because the mean of its divisors is an integer number (30553075752375).

Almost surely, 2^{122212220202221} is an apocalyptic number.

It is an amenable number.

122212220202221 is a deficient number, since it is larger than the sum of its proper divisors (82807279).

122212220202221 is an equidigital number, since it uses as much as digits as its factorization.

122212220202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82807278.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 122212220202221 its reverse (122202022212221), we get a palindrome (244414242414442).

The spelling of 122212220202221 in words is "one hundred twenty-two trillion, two hundred twelve billion, two hundred twenty million, two hundred two thousand, two hundred twenty-one".