4002021525 has 24 divisors (see below), whose sum is σ = 6631024000. Its totient is φ = 2129783040.

The previous prime is 4002021503. The next prime is 4002021533. The reversal of 4002021525 is 5251202004.

It is a happy number.

It is not a de Polignac number, because 4002021525 - 2¹⁶ = 4001955989 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22900 + ... + 92349.

Almost surely, 2^4002021525 is an apocalyptic number.

It is an amenable number.

4002021525 is a deficient number, since it is larger than the sum of its proper divisors (2629002475).

4002021525 is a wasteful number, since it uses less digits than its factorization.

4002021525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115725 (or 115720 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 4002021525 is about 63261.5327430501. The cubic root of 4002021525 is about 1587.6684211748.

Adding to 4002021525 its reverse (5251202004), we get a palindrome (9253223529).

The spelling of 4002021525 in words is "four billion, two million, twenty-one thousand, five hundred twenty-five".