4021221530 has 16 divisors (see below), whose sum is σ = 7244100864. Its totient is φ = 1607177040.

The previous prime is 4021221527. The next prime is 4021221539. The reversal of 4021221530 is 351221204.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4021221539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151022 + ... + 175641.

It is an arithmetic number, because the mean of its divisors is an integer number (452756304).

Almost surely, 2^4021221530 is an apocalyptic number.

4021221530 is a deficient number, since it is larger than the sum of its proper divisors (3222879334).

4021221530 is a wasteful number, since it uses less digits than its factorization.

4021221530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327901.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 4021221530 is about 63413.1021950511. The cubic root of 4021221530 is about 1590.2033586131.

Adding to 4021221530 its reverse (351221204), we get a palindrome (4372442734).

The spelling of 4021221530 in words is "four billion, twenty-one million, two hundred twenty-one thousand, five hundred thirty".