1002121121 has 4 divisors (see below), whose sum is σ = 1002852372. Its totient is φ = 1001389872.

The previous prime is 1002121111. The next prime is 1002121157. The reversal of 1002121121 is 1211212001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1211212001 = 1933 ⋅626597.

It can be written as a sum of positive squares in 2 ways, for example, as 964972096 + 37149025 = 31064^2 + 6095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002121121 - 2¹⁴ = 1002104737 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 (1002121111) 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, 363566 + ... + 366311.

It is an arithmetic number, because the mean of its divisors is an integer number (250713093).

Almost surely, 2^1002121121 is an apocalyptic number.

It is an amenable number.

1002121121 is a deficient number, since it is larger than the sum of its proper divisors (731251).

1002121121 is an equidigital number, since it uses as much as digits as its factorization.

1002121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731250.

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

The square root of 1002121121 is about 31656.2967038155. The cubic root of 1002121121 is about 1000.7065410156.

Adding to 1002121121 its reverse (1211212001), we get a palindrome (2213333122).

The spelling of 1002121121 in words is "one billion, two million, one hundred twenty-one thousand, one hundred twenty-one".