1221400133 has 8 divisors (see below), whose sum is σ = 1255377240. Its totient is φ = 1187873280.

The previous prime is 1221400097. The next prime is 1221400153. The reversal of 1221400133 is 3310041221.

It can be written as a sum of positive squares in 4 ways, for example, as 47789569 + 1173610564 = 6913^2 + 34258^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221400133 - 2⁶ = 1221400069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221400153) 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 7 ways as a sum of consecutive naturals, for example, 107060 + ... + 117917.

It is an arithmetic number, because the mean of its divisors is an integer number (156922155).

Almost surely, 2^1221400133 is an apocalyptic number.

It is an amenable number.

1221400133 is a deficient number, since it is larger than the sum of its proper divisors (33977107).

1221400133 is an equidigital number, since it uses as much as digits as its factorization.

1221400133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225127.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1221400133 is about 34948.5354914909. The cubic root of 1221400133 is about 1068.9383399233.

Adding to 1221400133 its reverse (3310041221), we get a palindrome (4531441354).

The spelling of 1221400133 in words is "one billion, two hundred twenty-one million, four hundred thousand, one hundred thirty-three".