1221401313 has 12 divisors (see below), whose sum is σ = 1924632528. Its totient is φ = 740243160.

The previous prime is 1221401287. The next prime is 1221401327. The reversal of 1221401313 is 3131041221.

It is not a de Polignac number, because 1221401313 - 2⁵ = 1221401281 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221401813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6168595 + ... + 6168792.

It is an arithmetic number, because the mean of its divisors is an integer number (160386044).

Almost surely, 2^1221401313 is an apocalyptic number.

It is an amenable number.

1221401313 is a deficient number, since it is larger than the sum of its proper divisors (703231215).

1221401313 is a wasteful number, since it uses less digits than its factorization.

1221401313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12337404 (or 12337401 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1221401313 is about 34948.5523734532. The cubic root of 1221401313 is about 1068.9386841585.

Adding to 1221401313 its reverse (3131041221), we get a palindrome (4352442534).

The spelling of 1221401313 in words is "one billion, two hundred twenty-one million, four hundred one thousand, three hundred thirteen".