2021340923 has 4 divisors (see below), whose sum is σ = 2310103920. Its totient is φ = 1732577928.

The previous prime is 2021340913. The next prime is 2021340943. The reversal of 2021340923 is 3290431202.

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 2021340923 - 2¹² = 2021336827 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021340892 and 2021340901.

It is not an unprimeable number, because it can be changed into a prime (2021340913) 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, 144381488 + ... + 144381501.

It is an arithmetic number, because the mean of its divisors is an integer number (577525980).

Almost surely, 2^2021340923 is an apocalyptic number.

2021340923 is a deficient number, since it is larger than the sum of its proper divisors (288762997).

2021340923 is an equidigital number, since it uses as much as digits as its factorization.

2021340923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288762996.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 2021340923 is about 44959.3252062350. The cubic root of 2021340923 is about 1264.3865175088.

The spelling of 2021340923 in words is "two billion, twenty-one million, three hundred forty thousand, nine hundred twenty-three".