1220122201021 has 2 divisors, whose sum is σ = 1220122201022. Its totient is φ = 1220122201020.

The previous prime is 1220122200943. The next prime is 1220122201127. The reversal of 1220122201021 is 1201022210221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1203836868025 + 16285332996 = 1097195^2 + 127614^2 .

It is an emirp because it is prime and its reverse (1201022210221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220122201021 - 2⁷ = 1220122200893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220122200986 and 1220122201004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220125201021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610061100510 + 610061100511.

It is an arithmetic number, because the mean of its divisors is an integer number (610061100511).

Almost surely, 2^{1220122201021} is an apocalyptic number.

It is an amenable number.

1220122201021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220122201021 is an equidigital number, since it uses as much as digits as its factorization.

1220122201021 is an evil number, because the sum of its binary digits is even.

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

Adding to 1220122201021 its reverse (1201022210221), we get a palindrome (2421144411242).

The spelling of 1220122201021 in words is "one trillion, two hundred twenty billion, one hundred twenty-two million, two hundred one thousand, twenty-one".