1221442533 has 24 divisors (see below), whose sum is σ = 1805821056. Its totient is φ = 795211200.

The previous prime is 1221442529. The next prime is 1221442553. The reversal of 1221442533 is 3352441221.

1221442533 is a `hidden beast` number, since 122 + 1 + 4 + 4 + 2 + 533 = 666.

It is not a de Polignac number, because 1221442533 - 2² = 1221442529 is a prime.

It is a super-2 number, since 2×1221442533² = 2983843722842912178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221442497 and 1221442506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221442513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 204753 + ... + 210633.

It is an arithmetic number, because the mean of its divisors is an integer number (75242544).

Almost surely, 2^1221442533 is an apocalyptic number.

It is an amenable number.

1221442533 is a deficient number, since it is larger than the sum of its proper divisors (584378523).

1221442533 is a wasteful number, since it uses less digits than its factorization.

1221442533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6425 (or 6422 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 1221442533 is about 34949.1420924749. The cubic root of 1221442533 is about 1068.9507089142.

Adding to 1221442533 its reverse (3352441221), we get a palindrome (4573883754).

The spelling of 1221442533 in words is "one billion, two hundred twenty-one million, four hundred forty-two thousand, five hundred thirty-three".