1221434042 has 12 divisors (see below), whose sum is σ = 1852992366. Its totient is φ = 603847200.

The previous prime is 1221434033. The next prime is 1221434083. The reversal of 1221434042 is 2404341221.

It can be written as a sum of positive squares in 3 ways, for example, as 946239121 + 275194921 = 30761^2 + 16589^2 .

It is a super-2 number, since 2×1221434042² = 2983802237912915528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221433999 and 1221434017.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22709 + ... + 54392.

Almost surely, 2^1221434042 is an apocalyptic number.

1221434042 is a deficient number, since it is larger than the sum of its proper divisors (631558324).

1221434042 is an frugal number, since it uses more digits than its factorization.

1221434042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77281 (or 77192 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1221434042 is about 34949.0206157483. The cubic root of 1221434042 is about 1068.9482319300.

Adding to 1221434042 its reverse (2404341221), we get a palindrome (3625775263).

The spelling of 1221434042 in words is "one billion, two hundred twenty-one million, four hundred thirty-four thousand, forty-two".