224021381 has 4 divisors (see below), whose sum is σ = 235812000. Its totient is φ = 212230764.

The previous prime is 224021377. The next prime is 224021383. The reversal of 224021381 is 183120422.

It is a happy number.

224021381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183120422 = 2 ⋅91560211.

It is a cyclic number.

It is not a de Polignac number, because 224021381 - 2² = 224021377 is a prime.

It is a super-2 number, since 2×224021381² = 100371158290294322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224021383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5895281 + ... + 5895318.

It is an arithmetic number, because the mean of its divisors is an integer number (58953000).

Almost surely, 2^224021381 is an apocalyptic number.

It is an amenable number.

224021381 is a deficient number, since it is larger than the sum of its proper divisors (11790619).

224021381 is a wasteful number, since it uses less digits than its factorization.

224021381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11790618.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 224021381 is about 14967.3438191284. The cubic root of 224021381 is about 607.3371167689.

The spelling of 224021381 in words is "two hundred twenty-four million, twenty-one thousand, three hundred eighty-one".