1242221424 has 40 divisors (see below), whose sum is σ = 3295808400. Its totient is φ = 402882048.

The previous prime is 1242221423. The next prime is 1242221437. The reversal of 1242221424 is 4241222421.

It is a happy number.

It is a super-2 number, since 2×1242221424² = 3086228132489175552, which contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1242221394 and 1242221403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242221423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347949 + ... + 351500.

It is an arithmetic number, because the mean of its divisors is an integer number (82395210).

Almost surely, 2^1242221424 is an apocalyptic number.

It is an amenable number.

1242221424 is an abundant number, since it is smaller than the sum of its proper divisors (2053586976).

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

1242221424 is a wasteful number, since it uses less digits than its factorization.

1242221424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699497 (or 699491 counting only the distinct ones).

The product of its digits is 2048, while the sum is 24.

The square root of 1242221424 is about 35245.1617105100. The cubic root of 1242221424 is about 1074.9782361557.

Adding to 1242221424 its reverse (4241222421), we get a palindrome (5483443845).

The spelling of 1242221424 in words is "one billion, two hundred forty-two million, two hundred twenty-one thousand, four hundred twenty-four".