4000021211 has 4 divisors (see below), whose sum is σ = 4006204272. Its totient is φ = 3993838152.

The previous prime is 4000021199. The next prime is 4000021261. The reversal of 4000021211 is 1121200004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4000021211 - 2¹⁸ = 3999759067 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4000021192 and 4000021201.

It is not an unprimeable number, because it can be changed into a prime (4000021261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3090560 + ... + 3091853.

It is an arithmetic number, because the mean of its divisors is an integer number (1001551068).

Almost surely, 2^4000021211 is an apocalyptic number.

4000021211 is a deficient number, since it is larger than the sum of its proper divisors (6183061).

4000021211 is an equidigital number, since it uses as much as digits as its factorization.

4000021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6183060.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 4000021211 is about 63245.7208908239. The cubic root of 4000021211 is about 1587.4038578269.

Adding to 4000021211 its reverse (1121200004), we get a palindrome (5121221215).

The spelling of 4000021211 in words is "four billion, twenty-one thousand, two hundred eleven".