1210221602 has 18 divisors (see below), whose sum is σ = 1929731697. Its totient is φ = 569122464.

The previous prime is 1210221601. The next prime is 1210221611. The reversal of 1210221602 is 2061220121.

It can be written as a sum of positive squares in 2 ways, for example, as 1107624961 + 102596641 = 33281^2 + 10129^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=24599.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210221601) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 835643 + ... + 837089.

Almost surely, 2^1210221602 is an apocalyptic number.

1210221602 is a deficient number, since it is larger than the sum of its proper divisors (719510095).

1210221602 is an frugal number, since it uses more digits than its factorization.

1210221602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2930 (or 1466 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1210221602 is about 34788.2394208158. The cubic root of 1210221602 is about 1065.6672850235.

Adding to 1210221602 its reverse (2061220121), we get a palindrome (3271441723).

The spelling of 1210221602 in words is "one billion, two hundred ten million, two hundred twenty-one thousand, six hundred two".