2121302231 has 4 divisors (see below), whose sum is σ = 2123385000. Its totient is φ = 2119219464.

The previous prime is 2121302219. The next prime is 2121302243. The reversal of 2121302231 is 1322031212.

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

It is an interprime number because it is at equal distance from previous prime (2121302219) and next prime (2121302243).

It is a cyclic number.

It is not a de Polignac number, because 2121302231 - 2¹⁸ = 2121040087 is a prime.

It is a super-2 number, since 2×2121302231² = 8999846310491154722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121352231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1039856 + ... + 1041893.

It is an arithmetic number, because the mean of its divisors is an integer number (530846250).

Almost surely, 2^2121302231 is an apocalyptic number.

2121302231 is a deficient number, since it is larger than the sum of its proper divisors (2082769).

2121302231 is a wasteful number, since it uses less digits than its factorization.

2121302231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2082768.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2121302231 is about 46057.5968869415. The cubic root of 2121302231 is about 1284.8946364477.

Adding to 2121302231 its reverse (1322031212), we get a palindrome (3443333443).

The spelling of 2121302231 in words is "two billion, one hundred twenty-one million, three hundred two thousand, two hundred thirty-one".