221242373 has 4 divisors (see below), whose sum is σ = 241355328. Its totient is φ = 201129420.

The previous prime is 221242337. The next prime is 221242409. The reversal of 221242373 is 373242122.

It is a happy number.

221242373 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.

It is an interprime number because it is at equal distance from previous prime (221242337) and next prime (221242409).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221242373 is a prime.

It is a super-2 number, since 2×221242373² = 97896375221342258, 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 (221242873) 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, 10056461 + ... + 10056482.

It is an arithmetic number, because the mean of its divisors is an integer number (60338832).

Almost surely, 2^221242373 is an apocalyptic number.

It is an amenable number.

221242373 is a deficient number, since it is larger than the sum of its proper divisors (20112955).

221242373 is a wasteful number, since it uses less digits than its factorization.

221242373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20112954.

The product of its digits is 4032, while the sum is 26.

The square root of 221242373 is about 14874.2183996336. The cubic root of 221242373 is about 604.8153004936.

Adding to 221242373 its reverse (373242122), we get a palindrome (594484495).

The spelling of 221242373 in words is "two hundred twenty-one million, two hundred forty-two thousand, three hundred seventy-three".