1221140434 has 4 divisors (see below), whose sum is σ = 1831710654. Its totient is φ = 610570216.

The previous prime is 1221140429. The next prime is 1221140441. The reversal of 1221140434 is 4340411221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4340411221 = 39023 ⋅111227.

It can be written as a sum of positive squares in only one way, i.e., 1104565225 + 116575209 = 33235^2 + 10797^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305285107 + ... + 305285110.

Almost surely, 2^1221140434 is an apocalyptic number.

1221140434 is a deficient number, since it is larger than the sum of its proper divisors (610570220).

1221140434 is an equidigital number, since it uses as much as digits as its factorization.

1221140434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610570219.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1221140434 is about 34944.8198450071. The cubic root of 1221140434 is about 1068.8625738994.

Adding to 1221140434 its reverse (4340411221), we get a palindrome (5561551655).

The spelling of 1221140434 in words is "one billion, two hundred twenty-one million, one hundred forty thousand, four hundred thirty-four".