2121203031 has 4 divisors (see below), whose sum is σ = 2828270712. Its totient is φ = 1414135352.

The previous prime is 2121203017. The next prime is 2121203059. The reversal of 2121203031 is 1303021212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121203031 - 2⁷ = 2121202903 is a prime.

It is a super-2 number, since 2×2121203031² = 8999004597447173922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2121203031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121203531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353533836 + ... + 353533841.

It is an arithmetic number, because the mean of its divisors is an integer number (707067678).

Almost surely, 2^2121203031 is an apocalyptic number.

2121203031 is a deficient number, since it is larger than the sum of its proper divisors (707067681).

2121203031 is an equidigital number, since it uses as much as digits as its factorization.

2121203031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707067680.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2121203031 is about 46056.5199618903. The cubic root of 2121203031 is about 1284.8746073145.

Adding to 2121203031 its reverse (1303021212), we get a palindrome (3424224243).

The spelling of 2121203031 in words is "two billion, one hundred twenty-one million, two hundred three thousand, thirty-one".