1200140021 has 4 divisors (see below), whose sum is σ = 1200308544. Its totient is φ = 1199971500.

The previous prime is 1200140017. The next prime is 1200140027. The reversal of 1200140021 is 1200410021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1200140021 - 2² = 1200140017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200139984 and 1200140011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200140027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73085 + ... + 87986.

It is an arithmetic number, because the mean of its divisors is an integer number (300077136).

Almost surely, 2^1200140021 is an apocalyptic number.

It is an amenable number.

1200140021 is a deficient number, since it is larger than the sum of its proper divisors (168523).

1200140021 is an equidigital number, since it uses as much as digits as its factorization.

1200140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168522.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1200140021 is about 34643.0371214765. The cubic root of 1200140021 is about 1062.6998993850.

Adding to 1200140021 its reverse (1200410021), we get a palindrome (2400550042).

The spelling of 1200140021 in words is "one billion, two hundred million, one hundred forty thousand, twenty-one".