4021252081 has 64 divisors (see below), whose sum is σ = 5391360000. Its totient is φ = 2967518400.

The previous prime is 4021252061. The next prime is 4021252091. The reversal of 4021252081 is 1802521204.

It is not a de Polignac number, because 4021252081 - 2⁵ = 4021252049 is a prime.

It is a super-2 number, since 2×4021252081² = 32340936597893661122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4021252051) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12929916 + ... + 12930226.

It is an arithmetic number, because the mean of its divisors is an integer number (84240000).

Almost surely, 2^4021252081 is an apocalyptic number.

It is an amenable number.

4021252081 is a deficient number, since it is larger than the sum of its proper divisors (1370107919).

4021252081 is a wasteful number, since it uses less digits than its factorization.

4021252081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 501 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 4021252081 is about 63413.3430832975. The cubic root of 4021252081 is about 1590.2073857625.

Adding to 4021252081 its reverse (1802521204), we get a palindrome (5823773285).

The spelling of 4021252081 in words is "four billion, twenty-one million, two hundred fifty-two thousand, eighty-one".