4001923021 has 8 divisors (see below), whose sum is σ = 4139993088. Its totient is φ = 3864414000.

The previous prime is 4001922971. The next prime is 4001923031. The reversal of 4001923021 is 1203291004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4001923021 - 2¹¹ = 4001920973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4001922983 and 4001923001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4001923031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125725 + ... + 154306.

It is an arithmetic number, because the mean of its divisors is an integer number (517499136).

Almost surely, 2^4001923021 is an apocalyptic number.

It is an amenable number.

4001923021 is a deficient number, since it is larger than the sum of its proper divisors (138070067).

4001923021 is a wasteful number, since it uses less digits than its factorization.

4001923021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280523.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 4001923021 is about 63260.7541924691. The cubic root of 4001923021 is about 1587.6553950102.

The spelling of 4001923021 in words is "four billion, one million, nine hundred twenty-three thousand, twenty-one".