4000021764 has 12 divisors (see below), whose sum is σ = 9333384144. Its totient is φ = 1333340584.

The previous prime is 4000021757. The next prime is 4000021807. The reversal of 4000021764 is 4671200004.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×4000021764² = 32000348224947343392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166667562 + ... + 166667585.

It is an arithmetic number, because the mean of its divisors is an integer number (777782012).

Almost surely, 2^4000021764 is an apocalyptic number.

It is an amenable number.

4000021764 is an abundant number, since it is smaller than the sum of its proper divisors (5333362380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4000021764 is a wasteful number, since it uses less digits than its factorization.

4000021764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333335154 (or 333335152 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 4000021764 is about 63245.7252626610. The cubic root of 4000021764 is about 1587.4039309794.

Adding to 4000021764 its reverse (4671200004), we get a palindrome (8671221768).

The spelling of 4000021764 in words is "four billion, twenty-one thousand, seven hundred sixty-four".