1210332221 has 16 divisors (see below), whose sum is σ = 1492245504. Its totient is φ = 957974784.

The previous prime is 1210332191. The next prime is 1210332229. The reversal of 1210332221 is 1222330121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210332221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1210332221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210332229) 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, 89645 + ... + 102258.

It is an arithmetic number, because the mean of its divisors is an integer number (93265344).

Almost surely, 2^1210332221 is an apocalyptic number.

It is an amenable number.

1210332221 is a deficient number, since it is larger than the sum of its proper divisors (281913283).

1210332221 is a wasteful number, since it uses less digits than its factorization.

1210332221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191980.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1210332221 is about 34789.8292752350. The cubic root of 1210332221 is about 1065.6997527572.

Adding to 1210332221 its reverse (1222330121), we get a palindrome (2432662342).

The spelling of 1210332221 in words is "one billion, two hundred ten million, three hundred thirty-two thousand, two hundred twenty-one".