1301312221 has 4 divisors (see below), whose sum is σ = 1419613344. Its totient is φ = 1183011100.

The previous prime is 1301312167. The next prime is 1301312227. The reversal of 1301312221 is 1222131031.

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 1301312221 - 2¹¹ = 1301310173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1301312195 and 1301312204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1301312227) 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, 59150545 + ... + 59150566.

It is an arithmetic number, because the mean of its divisors is an integer number (354903336).

Almost surely, 2^1301312221 is an apocalyptic number.

1301312221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1301312221 is a deficient number, since it is larger than the sum of its proper divisors (118301123).

1301312221 is a wasteful number, since it uses less digits than its factorization.

1301312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118301122.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1301312221 is about 36073.7053960360. The cubic root of 1301312221 is about 1091.7599771790.

Adding to 1301312221 its reverse (1222131031), we get a palindrome (2523443252).

The spelling of 1301312221 in words is "one billion, three hundred one million, three hundred twelve thousand, two hundred twenty-one".