1311221301 has 16 divisors (see below), whose sum is σ = 1905468096. Its totient is φ = 797181696.

The previous prime is 1311221299. The next prime is 1311221321. The reversal of 1311221301 is 1031221131.

It is a happy number.

It is not a de Polignac number, because 1311221301 - 2¹ = 1311221299 is a prime.

It is a super-2 number, since 2×1311221301² = 3438602600392265202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311221321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199300 + ... + 205773.

It is an arithmetic number, because the mean of its divisors is an integer number (119091756).

Almost surely, 2^1311221301 is an apocalyptic number.

It is an amenable number.

1311221301 is a deficient number, since it is larger than the sum of its proper divisors (594246795).

1311221301 is a wasteful number, since it uses less digits than its factorization.

1311221301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405172.

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

The square root of 1311221301 is about 36210.7898422556. The cubic root of 1311221301 is about 1094.5241083782.

Adding to 1311221301 its reverse (1031221131), we get a palindrome (2342442432).

The spelling of 1311221301 in words is "one billion, three hundred eleven million, two hundred twenty-one thousand, three hundred one".