221434420440 has 32 divisors (see below), whose sum is σ = 664303261680. Its totient is φ = 59049178752.

The previous prime is 221434420429. The next prime is 221434420547. The reversal of 221434420440 is 44024434122.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 221434420398 and 221434420407.

It is a congruent number.

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, 922643299 + ... + 922643538.

Almost surely, 2^221434420440 is an apocalyptic number.

221434420440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221434420440 is an abundant number, since it is smaller than the sum of its proper divisors (442868841240).

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

221434420440 is a wasteful number, since it uses less digits than its factorization.

221434420440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845286851 (or 1845286847 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 221434420440 its reverse (44024434122), we get a palindrome (265458854562).

The spelling of 221434420440 in words is "two hundred twenty-one billion, four hundred thirty-four million, four hundred twenty thousand, four hundred forty".