1310221121 has 4 divisors (see below), whose sum is σ = 1429332144. Its totient is φ = 1191110100.

The previous prime is 1310221117. The next prime is 1310221139. The reversal of 1310221121 is 1211220131.

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 1310221121 - 2² = 1310221117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1310221096 and 1310221105.

It is not an unprimeable number, because it can be changed into a prime (1310221141) 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, 59555495 + ... + 59555516.

It is an arithmetic number, because the mean of its divisors is an integer number (357333036).

Almost surely, 2^1310221121 is an apocalyptic number.

1310221121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1310221121 is a deficient number, since it is larger than the sum of its proper divisors (119111023).

1310221121 is a wasteful number, since it uses less digits than its factorization.

1310221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119111022.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1310221121 is about 36196.9766831430. The cubic root of 1310221121 is about 1094.2457420476.

Adding to 1310221121 its reverse (1211220131), we get a palindrome (2521441252).

The spelling of 1310221121 in words is "one billion, three hundred ten million, two hundred twenty-one thousand, one hundred twenty-one".