1311221007 has 32 divisors (see below), whose sum is σ = 2065305600. Its totient is φ = 820344096.

The previous prime is 1311220979. The next prime is 1311221039. The reversal of 1311221007 is 7001221131.

It is a happy number.

1311221007 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1311221007 - 2¹² = 1311216911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311221077) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12994 + ... + 52832.

It is an arithmetic number, because the mean of its divisors is an integer number (64540800).

Almost surely, 2^1311221007 is an apocalyptic number.

1311221007 is a deficient number, since it is larger than the sum of its proper divisors (754084593).

1311221007 is a wasteful number, since it uses less digits than its factorization.

1311221007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39924 (or 39918 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 1311221007 is about 36210.7857826919. The cubic root of 1311221007 is about 1094.5240265740.

Adding to 1311221007 its reverse (7001221131), we get a palindrome (8312442138).

The spelling of 1311221007 in words is "one billion, three hundred eleven million, two hundred twenty-one thousand, seven".