1221035042 has 4 divisors (see below), whose sum is σ = 1831552566. Its totient is φ = 610517520.

The previous prime is 1221035021. The next prime is 1221035059. The reversal of 1221035042 is 2405301221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1143048481 + 77986561 = 33809^2 + 8831^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305258759 + ... + 305258762.

Almost surely, 2^1221035042 is an apocalyptic number.

1221035042 is a deficient number, since it is larger than the sum of its proper divisors (610517524).

1221035042 is an equidigital number, since it uses as much as digits as its factorization.

1221035042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610517523.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1221035042 is about 34943.3118350279. The cubic root of 1221035042 is about 1068.8318231896.

Adding to 1221035042 its reverse (2405301221), we get a palindrome (3626336263).

The spelling of 1221035042 in words is "one billion, two hundred twenty-one million, thirty-five thousand, forty-two".