1220421434 has 4 divisors (see below), whose sum is σ = 1830632154. Its totient is φ = 610210716.

The previous prime is 1220421427. The next prime is 1220421437. The reversal of 1220421434 is 4341240221.

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., 1215568225 + 4853209 = 34865^2 + 2203^2 .

It is not an unprimeable number, because it can be changed into a prime (1220421437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305105357 + ... + 305105360.

Almost surely, 2^1220421434 is an apocalyptic number.

1220421434 is a deficient number, since it is larger than the sum of its proper divisors (610210720).

1220421434 is an equidigital number, since it uses as much as digits as its factorization.

1220421434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610210719.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1220421434 is about 34934.5306824065. The cubic root of 1220421434 is about 1068.6527528036.

Adding to 1220421434 its reverse (4341240221), we get a palindrome (5561661655).

The spelling of 1220421434 in words is "one billion, two hundred twenty million, four hundred twenty-one thousand, four hundred thirty-four".