1221266632 has 8 divisors (see below), whose sum is σ = 2289874950. Its totient is φ = 610633312.

The previous prime is 1221266623. The next prime is 1221266639. The reversal of 1221266632 is 2366621221.

It can be written as a sum of positive squares in only one way, i.e., 1137982756 + 83283876 = 33734^2 + 9126^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1221266594 and 1221266603.

It is not an unprimeable number, because it can be changed into a prime (1221266639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76329157 + ... + 76329172.

Almost surely, 2^1221266632 is an apocalyptic number.

It is an amenable number.

1221266632 is a deficient number, since it is larger than the sum of its proper divisors (1068608318).

1221266632 is a wasteful number, since it uses less digits than its factorization.

1221266632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152658335 (or 152658331 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 1221266632 is about 34946.6254737135. The cubic root of 1221266632 is about 1068.8993929441.

Adding to 1221266632 its reverse (2366621221), we get a palindrome (3587887853).

The spelling of 1221266632 in words is "one billion, two hundred twenty-one million, two hundred sixty-six thousand, six hundred thirty-two".