1012320121 has 4 divisors (see below), whose sum is σ = 1014605712. Its totient is φ = 1010034532.

The previous prime is 1012320083. The next prime is 1012320151. The reversal of 1012320121 is 1210232101.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1012320121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1012320151) 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, 1142131 + ... + 1143016.

It is an arithmetic number, because the mean of its divisors is an integer number (253651428).

Almost surely, 2^1012320121 is an apocalyptic number.

It is an amenable number.

1012320121 is a deficient number, since it is larger than the sum of its proper divisors (2285591).

1012320121 is an equidigital number, since it uses as much as digits as its factorization.

1012320121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285590.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1012320121 is about 31816.9785020514. The cubic root of 1012320121 is about 1004.0899564510.

Adding to 1012320121 its reverse (1210232101), we get a palindrome (2222552222).

The spelling of 1012320121 in words is "one billion, twelve million, three hundred twenty thousand, one hundred twenty-one".