2031200021 has 16 divisors (see below), whose sum is σ = 2129328000. Its totient is φ = 1936132800.

The previous prime is 2031199981. The next prime is 2031200057. The reversal of 2031200021 is 1200021302.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2031200021 - 2⁶ = 2031199957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2031199975 and 2031200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031200071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251555 + ... + 259503.

It is an arithmetic number, because the mean of its divisors is an integer number (133083000).

Almost surely, 2^2031200021 is an apocalyptic number.

It is an amenable number.

2031200021 is a deficient number, since it is larger than the sum of its proper divisors (98127979).

2031200021 is an equidigital number, since it uses as much as digits as its factorization.

2031200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8140.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2031200021 is about 45068.8364726670. The cubic root of 2031200021 is about 1266.4388676759.

Adding to 2031200021 its reverse (1200021302), we get a palindrome (3231221323).

The spelling of 2031200021 in words is "two billion, thirty-one million, two hundred thousand, twenty-one".