4001221369 has 2 divisors, whose sum is σ = 4001221370. Its totient is φ = 4001221368.

The previous prime is 4001221361. The next prime is 4001221387. The reversal of 4001221369 is 9631221004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3999297600 + 1923769 = 63240^2 + 1387^2 .

It is a cyclic number.

It is not a de Polignac number, because 4001221369 - 2³ = 4001221361 is a prime.

It is a super-2 number, since 2×4001221369² = 32019544887484468322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4001221361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000610684 + 2000610685.

It is an arithmetic number, because the mean of its divisors is an integer number (2000610685).

Almost surely, 2^4001221369 is an apocalyptic number.

It is an amenable number.

4001221369 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001221369 is an equidigital number, since it uses as much as digits as its factorization.

4001221369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 4001221369 is about 63255.2082361603. The cubic root of 4001221369 is about 1587.5626023962.

The spelling of 4001221369 in words is "four billion, one million, two hundred twenty-one thousand, three hundred sixty-nine".