2185222170021 has 32 divisors (see below), whose sum is σ = 3377063923200. Its totient is φ = 1242947062080.

The previous prime is 2185222170017. The next prime is 2185222170031. The reversal of 2185222170021 is 1200712225812.

It is not a de Polignac number, because 2185222170021 - 2² = 2185222170017 is a prime.

It is a super-2 number, since 2×2185222170021² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185222170031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16218906 + ... + 16353083.

It is an arithmetic number, because the mean of its divisors is an integer number (105533247600).

Almost surely, 2^{2185222170021} is an apocalyptic number.

It is an amenable number.

2185222170021 is a deficient number, since it is larger than the sum of its proper divisors (1191841753179).

2185222170021 is a wasteful number, since it uses less digits than its factorization.

2185222170021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32572129.

The product of its (nonzero) digits is 8960, while the sum is 33.

Adding to 2185222170021 its reverse (1200712225812), we get a palindrome (3385934395833).

The spelling of 2185222170021 in words is "two trillion, one hundred eighty-five billion, two hundred twenty-two million, one hundred seventy thousand, twenty-one".