13821377 has 2 divisors, whose sum is σ = 13821378. Its totient is φ = 13821376.

The previous prime is 13821373. The next prime is 13821383. The reversal of 13821377 is 77312831.

13821377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13719616 + 101761 = 3704^2 + 319^2 .

It is a cyclic number.

It is not a de Polignac number, because 13821377 - 2² = 13821373 is a prime.

It is a super-2 number, since 2×13821377² = 382060924352258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13821373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6910688 + 6910689.

It is an arithmetic number, because the mean of its divisors is an integer number (6910689).

Almost surely, 2^13821377 is an apocalyptic number.

It is an amenable number.

13821377 is a deficient number, since it is larger than the sum of its proper divisors (1).

13821377 is an equidigital number, since it uses as much as digits as its factorization.

13821377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 32.

The square root of 13821377 is about 3717.7112582878. The cubic root of 13821377 is about 239.9848196417.

The spelling of 13821377 in words is "thirteen million, eight hundred twenty-one thousand, three hundred seventy-seven".