1331012121 has 4 divisors (see below), whose sum is σ = 1774682832. Its totient is φ = 887341412.

The previous prime is 1331012119. The next prime is 1331012147. The reversal of 1331012121 is 1212101331.

It is a happy number.

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 not a de Polignac number, because 1331012121 - 2¹ = 1331012119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1331012121.

It is not an unprimeable number, because it can be changed into a prime (1331012171) 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, 221835351 + ... + 221835356.

It is an arithmetic number, because the mean of its divisors is an integer number (443670708).

Almost surely, 2^1331012121 is an apocalyptic number.

It is an amenable number.

1331012121 is a deficient number, since it is larger than the sum of its proper divisors (443670711).

1331012121 is an equidigital number, since it uses as much as digits as its factorization.

1331012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443670710.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1331012121 is about 36483.0388125770. The cubic root of 1331012121 is about 1100.0033391083.

Adding to 1331012121 its reverse (1212101331), we get a palindrome (2543113452).

The spelling of 1331012121 in words is "one billion, three hundred thirty-one million, twelve thousand, one hundred twenty-one".