221213030424 has 64 divisors (see below), whose sum is σ = 573603193440. Its totient is φ = 71034393600.

The previous prime is 221213030413. The next prime is 221213030429. The reversal of 221213030424 is 424030312122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 221213030394 and 221213030403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221213030429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1143549 + ... + 1322924.

Almost surely, 2^221213030424 is an apocalyptic number.

221213030424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221213030424 is an abundant number, since it is smaller than the sum of its proper divisors (352390163016).

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

221213030424 is a wasteful number, since it uses less digits than its factorization.

221213030424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466620 (or 2466616 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 221213030424 its reverse (424030312122), we get a palindrome (645243342546).

The spelling of 221213030424 in words is "two hundred twenty-one billion, two hundred thirteen million, thirty thousand, four hundred twenty-four".