1221512033 has 48 divisors (see below), whose sum is σ = 1600067520. Its totient is φ = 923940864.

The previous prime is 1221512027. The next prime is 1221512059. The reversal of 1221512033 is 3302151221.

It is not a de Polignac number, because 1221512033 - 2²² = 1217317729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221511996 and 1221512014.

It is not an unprimeable number, because it can be changed into a prime (1221512063) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1788110 + ... + 1788792.

It is an arithmetic number, because the mean of its divisors is an integer number (33334740).

Almost surely, 2^1221512033 is an apocalyptic number.

It is an amenable number.

1221512033 is a deficient number, since it is larger than the sum of its proper divisors (378555487).

1221512033 is a wasteful number, since it uses less digits than its factorization.

1221512033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846 (or 839 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1221512033 is about 34950.1363802775. The cubic root of 1221512033 is about 1068.9709829380.

Adding to 1221512033 its reverse (3302151221), we get a palindrome (4523663254).

The spelling of 1221512033 in words is "one billion, two hundred twenty-one million, five hundred twelve thousand, thirty-three".