1336453721221 has 4 divisors (see below), whose sum is σ = 1336706030412. Its totient is φ = 1336201412032.

The previous prime is 1336453721177. The next prime is 1336453721227. The reversal of 1336453721221 is 1221273546331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1239180844225 + 97272876996 = 1113185^2 + 311886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1336453721221 - 2³⁷ = 1199014767749 is a prime.

It is a super-2 number, since 2×1336453721221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1336453721227) 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, 126146650 + ... + 126157243.

It is an arithmetic number, because the mean of its divisors is an integer number (334176507603).

Almost surely, 2^{1336453721221} is an apocalyptic number.

It is an amenable number.

1336453721221 is a deficient number, since it is larger than the sum of its proper divisors (252309191).

1336453721221 is an equidigital number, since it uses as much as digits as its factorization.

1336453721221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252309190.

The product of its digits is 181440, while the sum is 40.

The spelling of 1336453721221 in words is "one trillion, three hundred thirty-six billion, four hundred fifty-three million, seven hundred twenty-one thousand, two hundred twenty-one".