4154320021 has 4 divisors (see below), whose sum is σ = 4157220492. Its totient is φ = 4151419552.

The previous prime is 4154320019. The next prime is 4154320033. The reversal of 4154320021 is 1200234514.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1200234514 = 2 ⋅600117257.

It can be written as a sum of positive squares in 2 ways, for example, as 2478645796 + 1675674225 = 49786^2 + 40935^2 .

It is a cyclic number.

It is not a de Polignac number, because 4154320021 - 2¹ = 4154320019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4154319974 and 4154320001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4154320081) 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, 1448086 + ... + 1450951.

It is an arithmetic number, because the mean of its divisors is an integer number (1039305123).

Almost surely, 2^4154320021 is an apocalyptic number.

It is an amenable number.

4154320021 is a deficient number, since it is larger than the sum of its proper divisors (2900471).

4154320021 is a wasteful number, since it uses less digits than its factorization.

4154320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2900470.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 4154320021 is about 64454.0147779795. The cubic root of 4154320021 is about 1607.5579944683.

Adding to 4154320021 its reverse (1200234514), we get a palindrome (5354554535).

The spelling of 4154320021 in words is "four billion, one hundred fifty-four million, three hundred twenty thousand, twenty-one".