1221733153 has 4 divisors (see below), whose sum is σ = 1226144020. Its totient is φ = 1217322288.

The previous prime is 1221733147. The next prime is 1221733207. The reversal of 1221733153 is 3513371221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 323712064 + 898021089 = 17992^2 + 29967^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221733153 - 2¹³ = 1221724961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221733103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2205018 + ... + 2205571.

It is an arithmetic number, because the mean of its divisors is an integer number (306536005).

Almost surely, 2^1221733153 is an apocalyptic number.

It is an amenable number.

1221733153 is a deficient number, since it is larger than the sum of its proper divisors (4410867).

1221733153 is an equidigital number, since it uses as much as digits as its factorization.

1221733153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4410866.

The product of its digits is 3780, while the sum is 28.

The square root of 1221733153 is about 34953.2996010391. The cubic root of 1221733153 is about 1069.0354813073.

The spelling of 1221733153 in words is "one billion, two hundred twenty-one million, seven hundred thirty-three thousand, one hundred fifty-three".