221407143 has 8 divisors (see below), whose sum is σ = 295315056. Its totient is φ = 147552000.

The previous prime is 221407127. The next prime is 221407157. The reversal of 221407143 is 341704122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221407143 - 2⁴ = 221407127 is a prime.

It is a super-2 number, since 2×221407143² = 98042245942844898, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221407163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2058 + ... + 21143.

It is an arithmetic number, because the mean of its divisors is an integer number (36914382).

Almost surely, 2^221407143 is an apocalyptic number.

221407143 is a deficient number, since it is larger than the sum of its proper divisors (73907913).

221407143 is a wasteful number, since it uses less digits than its factorization.

221407143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26385.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 221407143 is about 14879.7561471954. The cubic root of 221407143 is about 604.9654083995.

The spelling of 221407143 in words is "two hundred twenty-one million, four hundred seven thousand, one hundred forty-three".