1221100444 has 6 divisors (see below), whose sum is σ = 2136925784. Its totient is φ = 610550220.

The previous prime is 1221100427. The next prime is 1221100453. The reversal of 1221100444 is 4440011221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152637552 + ... + 152637559.

Almost surely, 2^1221100444 is an apocalyptic number.

It is an amenable number.

1221100444 is a deficient number, since it is larger than the sum of its proper divisors (915825340).

1221100444 is a wasteful number, since it uses less digits than its factorization.

1221100444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305275115 (or 305275113 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1221100444 is about 34944.2476525107. The cubic root of 1221100444 is about 1068.8509060410.

Adding to 1221100444 its reverse (4440011221), we get a palindrome (5661111665).

The spelling of 1221100444 in words is "one billion, two hundred twenty-one million, one hundred thousand, four hundred forty-four".