4020227721 has 24 divisors (see below), whose sum is σ = 6049155840. Its totient is φ = 2668097232.

The previous prime is 4020227671. The next prime is 4020227723. The reversal of 4020227721 is 1277220204.

It is not a de Polignac number, because 4020227721 - 2¹⁵ = 4020194953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (4020227723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17095 + ... + 91283.

It is an arithmetic number, because the mean of its divisors is an integer number (252048160).

Almost surely, 2^4020227721 is an apocalyptic number.

It is an amenable number.

4020227721 is a deficient number, since it is larger than the sum of its proper divisors (2028928119).

4020227721 is an equidigital number, since it uses as much as digits as its factorization.

4020227721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74427 (or 74415 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 4020227721 is about 63405.2657198123. The cubic root of 4020227721 is about 1590.0723462987.

Adding to 4020227721 its reverse (1277220204), we get a palindrome (5297447925).

The spelling of 4020227721 in words is "four billion, twenty million, two hundred twenty-seven thousand, seven hundred twenty-one".