1221221434 has 4 divisors (see below), whose sum is σ = 1831832154. Its totient is φ = 610610716.

The previous prime is 1221221423. The next prime is 1221221437. The reversal of 1221221434 is 4341221221.

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., 1155660025 + 65561409 = 33995^2 + 8097^2 .

It is a super-2 number, since 2×1221221434² = 2982763581722032712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221221437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305305357 + ... + 305305360.

Almost surely, 2^1221221434 is an apocalyptic number.

1221221434 is a deficient number, since it is larger than the sum of its proper divisors (610610720).

1221221434 is an equidigital number, since it uses as much as digits as its factorization.

1221221434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610610719.

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

The square root of 1221221434 is about 34945.9787958500. The cubic root of 1221221434 is about 1068.8862064404.

Adding to 1221221434 its reverse (4341221221), we get a palindrome (5562442655).

The spelling of 1221221434 in words is "one billion, two hundred twenty-one million, two hundred twenty-one thousand, four hundred thirty-four".