1022122001221 has 4 divisors (see below), whose sum is σ = 1057367587500. Its totient is φ = 986876414944.

The previous prime is 1022122001209. The next prime is 1022122001231. The reversal of 1022122001221 is 1221002212201.

It is a happy number.

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 551327040196 + 470794961025 = 742514^2 + 686145^2 .

It is a cyclic number.

It is not a de Polignac number, because 1022122001221 - 2²³ = 1022113612613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1022122001195 and 1022122001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022122001231) 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, 17622793096 + ... + 17622793153.

It is an arithmetic number, because the mean of its divisors is an integer number (264341896875).

Almost surely, 2^{1022122001221} is an apocalyptic number.

It is an amenable number.

1022122001221 is a deficient number, since it is larger than the sum of its proper divisors (35245586279).

1022122001221 is an equidigital number, since it uses as much as digits as its factorization.

1022122001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35245586278.

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

Adding to 1022122001221 its reverse (1221002212201), we get a palindrome (2243124213422).

The spelling of 1022122001221 in words is "one trillion, twenty-two billion, one hundred twenty-two million, one thousand, two hundred twenty-one".