20342102221 has 16 divisors (see below), whose sum is σ = 25535692800. Its totient is φ = 15800205168.

The previous prime is 20342102189. The next prime is 20342102237. The reversal of 20342102221 is 12220124302.

It is a cyclic number.

It is not a de Polignac number, because 20342102221 - 2⁵ = 20342102189 is a prime.

It is a super-2 number, since 2×20342102221² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20342112221) 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, 3321901 + ... + 3328018.

It is an arithmetic number, because the mean of its divisors is an integer number (1595980800).

Almost surely, 2^20342102221 is an apocalyptic number.

It is an amenable number.

20342102221 is a deficient number, since it is larger than the sum of its proper divisors (5193590579).

20342102221 is a wasteful number, since it uses less digits than its factorization.

20342102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6649968.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20342102221 its reverse (12220124302), we get a palindrome (32562226523).

The spelling of 20342102221 in words is "twenty billion, three hundred forty-two million, one hundred two thousand, two hundred twenty-one".