1200021 has 16 divisors (see below), whose sum is σ = 1732800. Its totient is φ = 736128.

The previous prime is 1200007. The next prime is 1200061.

It is a happy number.

1200021 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1200021 - 2⁷ = 1199893 is a prime.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1199982 and 1200009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1825 + ... + 2393.

It is an arithmetic number, because the mean of its divisors is an integer number (108300).

2^1200021 is an apocalyptic number.

It is an amenable number.

1200021 is a deficient number, since it is larger than the sum of its proper divisors (532779).

1200021 is a wasteful number, since it uses less digits than its factorization.

1200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1200021 is about 1095.4547001132. The cubic root of 1200021 is about 106.2664767988.

It can be divided in two parts, 12000 and 21, that added together give a palindrome (12021).

The spelling of 1200021 in words is "one million, two hundred thousand, twenty-one".