1200133021 has 4 divisors (see below), whose sum is σ = 1200213532. Its totient is φ = 1200052512.

The previous prime is 1200133019. The next prime is 1200133057. The reversal of 1200133021 is 1203310021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 509179225 + 690953796 = 22565^2 + 26286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200133021 - 2¹ = 1200133019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200132992 and 1200133010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200133001) 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, 10626 + ... + 50131.

It is an arithmetic number, because the mean of its divisors is an integer number (300053383).

Almost surely, 2^1200133021 is an apocalyptic number.

It is an amenable number.

1200133021 is a deficient number, since it is larger than the sum of its proper divisors (80511).

1200133021 is an equidigital number, since it uses as much as digits as its factorization.

1200133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80510.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1200133021 is about 34642.9360909262. The cubic root of 1200133021 is about 1062.6978332611.

Adding to 1200133021 its reverse (1203310021), we get a palindrome (2403443042).

The spelling of 1200133021 in words is "one billion, two hundred million, one hundred thirty-three thousand, twenty-one".