14155321221 has 6 divisors (see below), whose sum is σ = 20446575110. Its totient is φ = 9436880808.

The previous prime is 14155321183. The next prime is 14155321223. The reversal of 14155321221 is 12212355141.

It is a happy number.

14155321221 is a `hidden beast` number, since 1 + 4 + 1 + 5 + 532 + 122 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12681912996 + 1473408225 = 112614^2 + 38385^2 .

It is not a de Polignac number, because 14155321221 - 2⁹ = 14155320709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14155321223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 786406726 + ... + 786406743.

Almost surely, 2^14155321221 is an apocalyptic number.

It is an amenable number.

14155321221 is a deficient number, since it is larger than the sum of its proper divisors (6291253889).

14155321221 is a wasteful number, since it uses less digits than its factorization.

14155321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572813475 (or 1572813472 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

Adding to 14155321221 its reverse (12212355141), we get a palindrome (26367676362).

The spelling of 14155321221 in words is "fourteen billion, one hundred fifty-five million, three hundred twenty-one thousand, two hundred twenty-one".