1031012121 has 4 divisors (see below), whose sum is σ = 1374682832. Its totient is φ = 687341412.

The previous prime is 1031012093. The next prime is 1031012123. The reversal of 1031012121 is 1212101301.

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: 1212101301 = 3 ⋅404033767.

It is not a de Polignac number, because 1031012121 - 2¹⁰ = 1031011097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1031012097 and 1031012106.

It is not an unprimeable number, because it can be changed into a prime (1031012123) 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, 171835351 + ... + 171835356.

It is an arithmetic number, because the mean of its divisors is an integer number (343670708).

Almost surely, 2^1031012121 is an apocalyptic number.

It is an amenable number.

1031012121 is a deficient number, since it is larger than the sum of its proper divisors (343670711).

1031012121 is an equidigital number, since it uses as much as digits as its factorization.

1031012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343670710.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1031012121 is about 32109.3774620437. The cubic root of 1031012121 is about 1010.2323162617.

Adding to 1031012121 its reverse (1212101301), we get a palindrome (2243113422).

The spelling of 1031012121 in words is "one billion, thirty-one million, twelve thousand, one hundred twenty-one".