1221434242 has 8 divisors (see below), whose sum is σ = 2093887296. Its totient is φ = 523471812.

The previous prime is 1221434233. The next prime is 1221434273. The reversal of 1221434242 is 2424341221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1221434242² = 2983803215060229128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43622638 + ... + 43622665.

It is an arithmetic number, because the mean of its divisors is an integer number (261735912).

Almost surely, 2^1221434242 is an apocalyptic number.

1221434242 is a deficient number, since it is larger than the sum of its proper divisors (872453054).

1221434242 is an equidigital number, since it uses as much as digits as its factorization.

1221434242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87245312.

The product of its digits is 3072, while the sum is 25.

The square root of 1221434242 is about 34949.0234770587. The cubic root of 1221434242 is about 1068.9482902739.

Adding to 1221434242 its reverse (2424341221), we get a palindrome (3645775463).

The spelling of 1221434242 in words is "one billion, two hundred twenty-one million, four hundred thirty-four thousand, two hundred forty-two".