1012021121 has 4 divisors (see below), whose sum is σ = 1015475412. Its totient is φ = 1008566832.

The previous prime is 1012021117. The next prime is 1012021123. The reversal of 1012021121 is 1211202101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1211202101 = 19 ⋅63747479.

It can be written as a sum of positive squares in 2 ways, for example, as 833130496 + 178890625 = 28864^2 + 13375^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012021121 - 2² = 1012021117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1012021123) 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, 1726706 + ... + 1727291.

It is an arithmetic number, because the mean of its divisors is an integer number (253868853).

Almost surely, 2^1012021121 is an apocalyptic number.

It is an amenable number.

1012021121 is a deficient number, since it is larger than the sum of its proper divisors (3454291).

1012021121 is an equidigital number, since it uses as much as digits as its factorization.

1012021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3454290.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1012021121 is about 31812.2794059149. The cubic root of 1012021121 is about 1003.9910903401.

Adding to 1012021121 its reverse (1211202101), we get a palindrome (2223223222).

The spelling of 1012021121 in words is "one billion, twelve million, twenty-one thousand, one hundred twenty-one".