221212240424 has 32 divisors (see below), whose sum is σ = 498974980800. Its totient is φ = 89815495680.

The previous prime is 221212240387. The next prime is 221212240433. The reversal of 221212240424 is 424042212122.

It is a junction number, because it is equal to n+sod(n) for n = 221212240393 and 221212240402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103952057 + ... + 103954184.

It is an arithmetic number, because the mean of its divisors is an integer number (15592968150).

Almost surely, 2^221212240424 is an apocalyptic number.

It is an amenable number.

221212240424 is an abundant number, since it is smaller than the sum of its proper divisors (277762740376).

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

221212240424 is a wasteful number, since it uses less digits than its factorization.

221212240424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207906273 (or 207906269 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 221212240424 its reverse (424042212122), we get a palindrome (645254452546).

The spelling of 221212240424 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred forty thousand, four hundred twenty-four".