1221212434 has 16 divisors (see below), whose sum is σ = 1973303640. Its totient is φ = 563472000.

The previous prime is 1221212423. The next prime is 1221212453. The reversal of 1221212434 is 4342121221.

It can be written as a sum of positive squares in 4 ways, for example, as 893711025 + 327501409 = 29895^2 + 18097^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170934 + ... + 177934.

Almost surely, 2^1221212434 is an apocalyptic number.

1221212434 is a deficient number, since it is larger than the sum of its proper divisors (752091206).

1221212434 is a wasteful number, since it uses less digits than its factorization.

1221212434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13725.

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

The square root of 1221212434 is about 34945.8500254322. The cubic root of 1221212434 is about 1068.8835806541.

Adding to 1221212434 its reverse (4342121221), we get a palindrome (5563333655).

The spelling of 1221212434 in words is "one billion, two hundred twenty-one million, two hundred twelve thousand, four hundred thirty-four".