4021515641 has 32 divisors (see below), whose sum is σ = 4932264960. Its totient is φ = 3228825600.

The previous prime is 4021515601. The next prime is 4021515647. The reversal of 4021515641 is 1465151204.

It is not a de Polignac number, because 4021515641 - 2²² = 4017321337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4021515647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 389441 + ... + 399633.

It is an arithmetic number, because the mean of its divisors is an integer number (154133280).

Almost surely, 2^4021515641 is an apocalyptic number.

It is an amenable number.

4021515641 is a deficient number, since it is larger than the sum of its proper divisors (910749319).

4021515641 is a wasteful number, since it uses less digits than its factorization.

4021515641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10337.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 4021515641 is about 63415.4211607871. The cubic root of 4021515641 is about 1590.2421266752.

Adding to 4021515641 its reverse (1465151204), we get a palindrome (5486666845).

The spelling of 4021515641 in words is "four billion, twenty-one million, five hundred fifteen thousand, six hundred forty-one".