1221711642 has 12 divisors (see below), whose sum is σ = 2647041930. Its totient is φ = 407237208.

The previous prime is 1221711637. The next prime is 1221711653. The reversal of 1221711642 is 2461171221.

1221711642 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 7 + 11 + 642 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1123523361 + 98188281 = 33519^2 + 9909^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33936417 + ... + 33936452.

Almost surely, 2^1221711642 is an apocalyptic number.

1221711642 is an abundant number, since it is smaller than the sum of its proper divisors (1425330288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221711642 is a wasteful number, since it uses less digits than its factorization.

1221711642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67872877 (or 67872874 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 1221711642 is about 34952.9918891073. The cubic root of 1221711642 is about 1069.0292071174.

Adding to 1221711642 its reverse (2461171221), we get a palindrome (3682882863).

The spelling of 1221711642 in words is "one billion, two hundred twenty-one million, seven hundred eleven thousand, six hundred forty-two".