1200240021 has 8 divisors (see below), whose sum is σ = 1600507744. Its totient is φ = 800066160.

The previous prime is 1200240017. The next prime is 1200240029. The reversal of 1200240021 is 1200420021.

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

It is not a de Polignac number, because 1200240021 - 2² = 1200240017 is a prime.

It is a super-2 number, since 2×1200240021² = 2881152216020160882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200239979 and 1200240006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200240029) 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, 15726 + ... + 51456.

It is an arithmetic number, because the mean of its divisors is an integer number (200063468).

Almost surely, 2^1200240021 is an apocalyptic number.

It is an amenable number.

1200240021 is a deficient number, since it is larger than the sum of its proper divisors (400267723).

1200240021 is a wasteful number, since it uses less digits than its factorization.

1200240021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46931.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1200240021 is about 34644.4803828835. The cubic root of 1200240021 is about 1062.7294145628.

Adding to 1200240021 its reverse (1200420021), we get a palindrome (2400660042).

The spelling of 1200240021 in words is "one billion, two hundred million, two hundred forty thousand, twenty-one".