1221012233 has 12 divisors (see below), whose sum is σ = 1503912852. Its totient is φ = 985017600.

The previous prime is 1221012227. The next prime is 1221012241. The reversal of 1221012233 is 3322101221.

It can be written as a sum of positive squares in 2 ways, for example, as 688695049 + 532317184 = 26243^2 + 23072^2 .

It is not a de Polignac number, because 1221012233 - 2⁸ = 1221011977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian 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 (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 732068 + ... + 733733.

It is an arithmetic number, because the mean of its divisors is an integer number (125326071).

Almost surely, 2^1221012233 is an apocalyptic number.

It is an amenable number.

1221012233 is a deficient number, since it is larger than the sum of its proper divisors (282900619).

1221012233 is a wasteful number, since it uses less digits than its factorization.

1221012233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465832 (or 1465825 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1221012233 is about 34942.9854620352. The cubic root of 1221012233 is about 1068.8251678695.

Adding to 1221012233 its reverse (3322101221), we get a palindrome (4543113454).

The spelling of 1221012233 in words is "one billion, two hundred twenty-one million, twelve thousand, two hundred thirty-three".