1221031442 has 4 divisors (see below), whose sum is σ = 1831547166. Its totient is φ = 610515720.

The previous prime is 1221031423. The next prime is 1221031459. The reversal of 1221031442 is 2441301221.

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., 841522081 + 379509361 = 29009^2 + 19481^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305257859 + ... + 305257862.

Almost surely, 2^1221031442 is an apocalyptic number.

1221031442 is a deficient number, since it is larger than the sum of its proper divisors (610515724).

1221031442 is an equidigital number, since it uses as much as digits as its factorization.

1221031442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610515723.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1221031442 is about 34943.2603229865. The cubic root of 1221031442 is about 1068.8307727697.

Adding to 1221031442 its reverse (2441301221), we get a palindrome (3662332663).

The spelling of 1221031442 in words is "one billion, two hundred twenty-one million, thirty-one thousand, four hundred forty-two".