1020220121 has 4 divisors (see below), whose sum is σ = 1020358452. Its totient is φ = 1020081792.

The previous prime is 1020220111. The next prime is 1020220127. The reversal of 1020220121 is 1210220201.

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: 1210220201 = 16091 ⋅75211.

It can be written as a sum of positive squares in 2 ways, for example, as 267486025 + 752734096 = 16355^2 + 27436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020220121 - 2¹⁰ = 1020219097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020220127) 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, 57440 + ... + 73073.

It is an arithmetic number, because the mean of its divisors is an integer number (255089613).

Almost surely, 2^1020220121 is an apocalyptic number.

It is an amenable number.

1020220121 is a deficient number, since it is larger than the sum of its proper divisors (138331).

1020220121 is an equidigital number, since it uses as much as digits as its factorization.

1020220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138330.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1020220121 is about 31940.8847873693. The cubic root of 1020220121 is about 1006.6951157235.

Adding to 1020220121 its reverse (1210220201), we get a palindrome (2230440322).

The spelling of 1020220121 in words is "one billion, twenty million, two hundred twenty thousand, one hundred twenty-one".