1020122221 has 4 divisors (see below), whose sum is σ = 1034096572. Its totient is φ = 1006147872.

The previous prime is 1020122219. The next prime is 1020122261. The reversal of 1020122221 is 1222210201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1222210201 = 409 ⋅2988289.

It can be written as a sum of positive squares in 2 ways, for example, as 574321225 + 445800996 = 23965^2 + 21114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020122221 - 2¹ = 1020122219 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 (1020122261) 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, 6987066 + ... + 6987211.

It is an arithmetic number, because the mean of its divisors is an integer number (258524143).

Almost surely, 2^1020122221 is an apocalyptic number.

It is an amenable number.

1020122221 is a deficient number, since it is larger than the sum of its proper divisors (13974351).

1020122221 is an equidigital number, since it uses as much as digits as its factorization.

1020122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13974350.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1020122221 is about 31939.3522320037. The cubic root of 1020122221 is about 1006.6629139786.

Adding to 1020122221 its reverse (1222210201), we get a palindrome (2242332422).

The spelling of 1020122221 in words is "one billion, twenty million, one hundred twenty-two thousand, two hundred twenty-one".