1200142021 has 8 divisors (see below), whose sum is σ = 1294143480. Its totient is φ = 1106380992.

The previous prime is 1200142019. The next prime is 1200142109. The reversal of 1200142021 is 1202410021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 50253921 + 1149888100 = 7089^2 + 33910^2 .

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 1200142021 - 2¹ = 1200142019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200141992 and 1200142010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200142621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49666 + ... + 69763.

It is an arithmetic number, because the mean of its divisors is an integer number (161767935).

Almost surely, 2^1200142021 is an apocalyptic number.

It is an amenable number.

1200142021 is a deficient number, since it is larger than the sum of its proper divisors (94001459).

1200142021 is a wasteful number, since it uses less digits than its factorization.

1200142021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120215.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1200142021 is about 34643.0659872939. The cubic root of 1200142021 is about 1062.7004897046.

Adding to 1200142021 its reverse (1202410021), we get a palindrome (2402552042).

The spelling of 1200142021 in words is "one billion, two hundred million, one hundred forty-two thousand, twenty-one".