221022399 has 8 divisors (see below), whose sum is σ = 317365552. Its totient is φ = 136013760.

The previous prime is 221022397. The next prime is 221022401. The reversal of 221022399 is 993220122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221022397) and next prime (221022401).

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

It is not a de Polignac number, because 221022399 - 2¹ = 221022397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022397) 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, 2833582 + ... + 2833659.

It is an arithmetic number, because the mean of its divisors is an integer number (39670694).

Almost surely, 2^221022399 is an apocalyptic number.

221022399 is a deficient number, since it is larger than the sum of its proper divisors (96343153).

221022399 is a wasteful number, since it uses less digits than its factorization.

221022399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5667257.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 221022399 is about 14866.8220881263. The cubic root of 221022399 is about 604.6147847167.

The spelling of 221022399 in words is "two hundred twenty-one million, twenty-two thousand, three hundred ninety-nine".