2212405621 has 8 divisors (see below), whose sum is σ = 2294415000. Its totient is φ = 2130777600.

The previous prime is 2212405603. The next prime is 2212405649. The reversal of 2212405621 is 1265042122.

It can be written as a sum of positive squares in 4 ways, for example, as 1696616100 + 515789521 = 41190^2 + 22711^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2212405621 - 2⁵ = 2212405589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212405651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83496 + ... + 106753.

It is an arithmetic number, because the mean of its divisors is an integer number (286801875).

Almost surely, 2^2212405621 is an apocalyptic number.

It is an amenable number.

2212405621 is a deficient number, since it is larger than the sum of its proper divisors (82009379).

2212405621 is a wasteful number, since it uses less digits than its factorization.

2212405621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190679.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 2212405621 is about 47036.2160574169. The cubic root of 2212405621 is about 1303.0315092607.

Adding to 2212405621 its reverse (1265042122), we get a palindrome (3477447743).

The spelling of 2212405621 in words is "two billion, two hundred twelve million, four hundred five thousand, six hundred twenty-one".