2121662231 has 4 divisors (see below), whose sum is σ = 2284867032. Its totient is φ = 1958457432.

The previous prime is 2121662201. The next prime is 2121662261. The reversal of 2121662231 is 1322661212.

It is a happy number.

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 (2121662201) and next prime (2121662261).

It is a cyclic number.

It is not a de Polignac number, because 2121662231 - 2¹⁸ = 2121400087 is a prime.

It is a super-2 number, since 2×2121662231² = 9002901244903794722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121662231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121662201) 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, 81602381 + ... + 81602406.

It is an arithmetic number, because the mean of its divisors is an integer number (571216758).

Almost surely, 2^2121662231 is an apocalyptic number.

2121662231 is a deficient number, since it is larger than the sum of its proper divisors (163204801).

2121662231 is a wasteful number, since it uses less digits than its factorization.

2121662231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163204800.

The product of its digits is 1728, while the sum is 26.

The square root of 2121662231 is about 46061.5048712045. The cubic root of 2121662231 is about 1284.9673175738.

The spelling of 2121662231 in words is "two billion, one hundred twenty-one million, six hundred sixty-two thousand, two hundred thirty-one".