2021123394 has 16 divisors (see below), whose sum is σ = 4491385440. Its totient is φ = 673707780.

The previous prime is 2021123393. The next prime is 2021123437. The reversal of 2021123394 is 4933211202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2021123393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18714052 + ... + 18714159.

It is an arithmetic number, because the mean of its divisors is an integer number (280711590).

Almost surely, 2^2021123394 is an apocalyptic number.

2021123394 is an abundant number, since it is smaller than the sum of its proper divisors (2470262046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021123394 is a wasteful number, since it uses less digits than its factorization.

2021123394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37428222 (or 37428216 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 2021123394 is about 44956.9059656022. The cubic root of 2021123394 is about 1264.3411597303.

Adding to 2021123394 its reverse (4933211202), we get a palindrome (6954334596).

The spelling of 2021123394 in words is "two billion, twenty-one million, one hundred twenty-three thousand, three hundred ninety-four".