Adding to 32122221 its reverse (12222123), we get a palindrome (44344344).
It is a happy number.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12222123 = 3 ⋅4074041.
It is a cyclic number.
It is a self number, because there is not a number n which added to its sum of digits gives 32122221.
It is a congruent number.
Almost surely, 232122221 is an apocalyptic number.
It is an amenable number.
32122221 is a wasteful number, since it uses less digits than its factorization.
32122221 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 10707410.
The square root of 32122221 is about 5667.6468662047. The cubic root of 32122221 is about 317.8838921874.
The spelling of 32122221 in words is "thirty-two million, one hundred twenty-two thousand, two hundred twenty-one".