1221131301 has 24 divisors (see below), whose sum is σ = 1866775680. Its totient is φ = 707256576.

The previous prime is 1221131189. The next prime is 1221131321. The reversal of 1221131301 is 1031311221.

It is a happy number.

It is not a de Polignac number, because 1221131301 - 2⁷ = 1221131173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221131321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62221 + ... + 79458.

It is an arithmetic number, because the mean of its divisors is an integer number (77782320).

Almost surely, 2^1221131301 is an apocalyptic number.

It is an amenable number.

1221131301 is a deficient number, since it is larger than the sum of its proper divisors (645644379).

1221131301 is a wasteful number, since it uses less digits than its factorization.

1221131301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141725 (or 141712 counting only the distinct ones).

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

The square root of 1221131301 is about 34944.6891673112. The cubic root of 1221131301 is about 1068.8599091919.

Adding to 1221131301 its reverse (1031311221), we get a palindrome (2252442522).

The spelling of 1221131301 in words is "one billion, two hundred twenty-one million, one hundred thirty-one thousand, three hundred one".