4002012221 has 4 divisors (see below), whose sum is σ = 4012572000. Its totient is φ = 3991452444.

The previous prime is 4002012169. The next prime is 4002012227. The reversal of 4002012221 is 1222102004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4002012221 is a prime.

It is a super-2 number, since 2×4002012221² = 32032203634066705682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4002012196 and 4002012205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4002012227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5279321 + ... + 5280078.

It is an arithmetic number, because the mean of its divisors is an integer number (1003143000).

Almost surely, 2^4002012221 is an apocalyptic number.

It is an amenable number.

4002012221 is a deficient number, since it is larger than the sum of its proper divisors (10559779).

4002012221 is a wasteful number, since it uses less digits than its factorization.

4002012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10559778.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 4002012221 is about 63261.4592070085. The cubic root of 4002012221 is about 1587.6671908234.

Adding to 4002012221 its reverse (1222102004), we get a palindrome (5224114225).

The spelling of 4002012221 in words is "four billion, two million, twelve thousand, two hundred twenty-one".