1221272633 has 32 divisors (see below), whose sum is σ = 1498429440. Its totient is φ = 972155520.

The previous prime is 1221272623. The next prime is 1221272651. The reversal of 1221272633 is 3362721221.

It is not a de Polignac number, because 1221272633 - 2¹⁰ = 1221271609 is a prime.

It is a super-2 number, since 2×1221272633² = 2983013688229505378, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221272596 and 1221272605.

It is not an unprimeable number, because it can be changed into a prime (1221272623) 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 31 ways as a sum of consecutive naturals, for example, 2672141 + ... + 2672597.

It is an arithmetic number, because the mean of its divisors is an integer number (46825920).

Almost surely, 2^1221272633 is an apocalyptic number.

It is an amenable number.

1221272633 is a deficient number, since it is larger than the sum of its proper divisors (277156807).

1221272633 is a wasteful number, since it uses less digits than its factorization.

1221272633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837.

The product of its digits is 6048, while the sum is 29.

The square root of 1221272633 is about 34946.7113331140. The cubic root of 1221272633 is about 1068.9011437096.

Adding to 1221272633 its reverse (3362721221), we get a palindrome (4583993854).

The spelling of 1221272633 in words is "one billion, two hundred twenty-one million, two hundred seventy-two thousand, six hundred thirty-three".