221230072 has 32 divisors (see below), whose sum is σ = 499017600. Its totient is φ = 89822304.

The previous prime is 221230069. The next prime is 221230073. The reversal of 221230072 is 270032122.

It is a super-4 number, since 4×221230072⁴ (a number of 34 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221230073) 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, 102898 + ... + 105025.

It is an arithmetic number, because the mean of its divisors is an integer number (15594300).

Almost surely, 2^221230072 is an apocalyptic number.

It is an amenable number.

221230072 is an abundant number, since it is smaller than the sum of its proper divisors (277787528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221230072 is a wasteful number, since it uses less digits than its factorization.

221230072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207955 (or 207951 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 221230072 is about 14873.8048931670. The cubic root of 221230072 is about 604.8040911115.

Adding to 221230072 its reverse (270032122), we get a palindrome (491262194).

The spelling of 221230072 in words is "two hundred twenty-one million, two hundred thirty thousand, seventy-two".