4020541221 has 16 divisors (see below), whose sum is σ = 5493398400. Its totient is φ = 2614068480.

The previous prime is 4020541183. The next prime is 4020541241. The reversal of 4020541221 is 1221450204.

It is not a de Polignac number, because 4020541221 - 2¹³ = 4020533029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4020541241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 645480 + ... + 651678.

It is an arithmetic number, because the mean of its divisors is an integer number (343337400).

Almost surely, 2^4020541221 is an apocalyptic number.

4020541221 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4020541221 is a deficient number, since it is larger than the sum of its proper divisors (1472857179).

4020541221 is a wasteful number, since it uses less digits than its factorization.

4020541221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11516.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 4020541221 is about 63407.7378637655. The cubic root of 4020541221 is about 1590.1136768533.

Adding to 4020541221 its reverse (1221450204), we get a palindrome (5241991425).

The spelling of 4020541221 in words is "four billion, twenty million, five hundred forty-one thousand, two hundred twenty-one".