6662222121 has 16 divisors (see below), whose sum is σ = 9324933120. Its totient is φ = 4225353360.

The previous prime is 6662222107. The next prime is 6662222153. The reversal of 6662222121 is 1212222666.

It is a happy number.

It is not a de Polignac number, because 6662222121 - 2¹⁵ = 6662189353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6662222221) 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, 601605 + ... + 612578.

It is an arithmetic number, because the mean of its divisors is an integer number (582808320).

Almost surely, 2^6662222121 is an apocalyptic number.

It is an amenable number.

6662222121 is a deficient number, since it is larger than the sum of its proper divisors (2662710999).

6662222121 is a wasteful number, since it uses less digits than its factorization.

6662222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214276.

The product of its digits is 6912, while the sum is 30.

The square root of 6662222121 is about 81622.4363824065. The cubic root of 6662222121 is about 1881.6537170211.

Adding to 6662222121 its reverse (1212222666), we get a palindrome (7874444787).

The spelling of 6662222121 in words is "six billion, six hundred sixty-two million, two hundred twenty-two thousand, one hundred twenty-one".