2121640323 has 16 divisors (see below), whose sum is σ = 3092797056. Its totient is φ = 1283019840.

The previous prime is 2121640289. The next prime is 2121640331. The reversal of 2121640323 is 3230461212.

It is not a de Polignac number, because 2121640323 - 2⁶ = 2121640259 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121640293 and 2121640302.

It is not an unprimeable number, because it can be changed into a prime (2121640333) 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, 55261 + ... + 85422.

It is an arithmetic number, because the mean of its divisors is an integer number (193299816).

Almost surely, 2^2121640323 is an apocalyptic number.

2121640323 is a deficient number, since it is larger than the sum of its proper divisors (971156733).

2121640323 is a wasteful number, since it uses less digits than its factorization.

2121640323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141154.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 2121640323 is about 46061.2670581260. The cubic root of 2121640323 is about 1284.9628947584.

The spelling of 2121640323 in words is "two billion, one hundred twenty-one million, six hundred forty thousand, three hundred twenty-three".