4040021025 has 36 divisors (see below), whose sum is σ = 7240202892. Its totient is φ = 2153464320.

The previous prime is 4040021023. The next prime is 4040021071. The reversal of 4040021025 is 5201200404.

It can be written as a sum of positive squares in 6 ways, for example, as 1016780769 + 3023240256 = 31887^2 + 54984^2 .

It is not a de Polignac number, because 4040021025 - 2¹ = 4040021023 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4040020989 and 4040021007.

It is not an unprimeable number, because it can be changed into a prime (4040021023) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 512917 + ... + 520733.

It is an arithmetic number, because the mean of its divisors is an integer number (201116747).

Almost surely, 2^4040021025 is an apocalyptic number.

4040021025 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4040021025 is a deficient number, since it is larger than the sum of its proper divisors (3200181867).

4040021025 is a wasteful number, since it uses less digits than its factorization.

4040021025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10130 (or 10122 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 4040021025 is about 63561.1597203827. The cubic root of 4040021025 is about 1592.6776112234.

Adding to 4040021025 its reverse (5201200404), we get a palindrome (9241221429).

It can be divided in two parts, 40400 and 21025, that added together give a triangular number (61425 = T₃₅₀).

The spelling of 4040021025 in words is "four billion, forty million, twenty-one thousand, twenty-five".