221442431 has 8 divisors (see below), whose sum is σ = 253169280. Its totient is φ = 189738648.

The previous prime is 221442421. The next prime is 221442433. The reversal of 221442431 is 134244122.

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

It is a cyclic number.

It is not a de Polignac number, because 221442431 - 2¹⁴ = 221426047 is a prime.

It is a super-2 number, since 2×221442431² = 98073500494379522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221442397 and 221442406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221442433) 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, 28040 + ... + 35058.

It is an arithmetic number, because the mean of its divisors is an integer number (31646160).

Almost surely, 2^221442431 is an apocalyptic number.

221442431 is a deficient number, since it is larger than the sum of its proper divisors (31726849).

221442431 is an equidigital number, since it uses as much as digits as its factorization.

221442431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11533.

The product of its digits is 1536, while the sum is 23.

The square root of 221442431 is about 14880.9418720725. The cubic root of 221442431 is about 604.9975466057.

Adding to 221442431 its reverse (134244122), we get a palindrome (355686553).

The spelling of 221442431 in words is "two hundred twenty-one million, four hundred forty-two thousand, four hundred thirty-one".