1221012734 has 8 divisors (see below), whose sum is σ = 1839380400. Its totient is φ = 607885936.

The previous prime is 1221012733. The next prime is 1221012739. The reversal of 1221012734 is 4372101221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221012733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1309634 + ... + 1310565.

It is an arithmetic number, because the mean of its divisors is an integer number (229922550).

Almost surely, 2^1221012734 is an apocalyptic number.

1221012734 is a deficient number, since it is larger than the sum of its proper divisors (618367666).

1221012734 is a wasteful number, since it uses less digits than its factorization.

1221012734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2620434.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1221012734 is about 34942.9926308552. The cubic root of 1221012734 is about 1068.8253140546.

Adding to 1221012734 its reverse (4372101221), we get a palindrome (5593113955).

The spelling of 1221012734 in words is "one billion, two hundred twenty-one million, twelve thousand, seven hundred thirty-four".