1221010533 has 24 divisors (see below), whose sum is σ = 1870128000. Its totient is φ = 765016704.

The previous prime is 1221010523. The next prime is 1221010537. The reversal of 1221010533 is 3350101221.

1221010533 is a `hidden beast` number, since 122 + 1 + 0 + 10 + 533 = 666.

It is not a de Polignac number, because 1221010533 - 2⁴ = 1221010517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221010537) 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 23 ways as a sum of consecutive naturals, for example, 107668 + ... + 118466.

It is an arithmetic number, because the mean of its divisors is an integer number (77922000).

Almost surely, 2^1221010533 is an apocalyptic number.

It is an amenable number.

1221010533 is a deficient number, since it is larger than the sum of its proper divisors (649117467).

1221010533 is a wasteful number, since it uses less digits than its factorization.

1221010533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11561 (or 11558 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1221010533 is about 34942.9611366867. The cubic root of 1221010533 is about 1068.8246718320.

Adding to 1221010533 its reverse (3350101221), we get a palindrome (4571111754).

The spelling of 1221010533 in words is "one billion, two hundred twenty-one million, ten thousand, five hundred thirty-three".