1020121121 has 4 divisors (see below), whose sum is σ = 1043844912. Its totient is φ = 996397332.

The previous prime is 1020121111. The next prime is 1020121133. The reversal of 1020121121 is 1211210201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1211210201 = 29 ⋅41765869.

It is a cyclic number.

It is not a de Polignac number, because 1020121121 - 2¹⁸ = 1019858977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020121111) 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, 11861831 + ... + 11861916.

It is an arithmetic number, because the mean of its divisors is an integer number (260961228).

Almost surely, 2^1020121121 is an apocalyptic number.

It is an amenable number.

1020121121 is a deficient number, since it is larger than the sum of its proper divisors (23723791).

1020121121 is an equidigital number, since it uses as much as digits as its factorization.

1020121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23723790.

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

The square root of 1020121121 is about 31939.3350118627. The cubic root of 1020121121 is about 1006.6625521495.

Adding to 1020121121 its reverse (1211210201), we get a palindrome (2231331322).

The spelling of 1020121121 in words is "one billion, twenty million, one hundred twenty-one thousand, one hundred twenty-one".