1221012444 has 12 divisors (see below), whose sum is σ = 2849029064. Its totient is φ = 407004144.

The previous prime is 1221012439. The next prime is 1221012461. The reversal of 1221012444 is 4442101221.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1221012444.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50875507 + ... + 50875530.

Almost surely, 2^1221012444 is an apocalyptic number.

It is an amenable number.

1221012444 is an abundant number, since it is smaller than the sum of its proper divisors (1628016620).

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

1221012444 is a wasteful number, since it uses less digits than its factorization.

1221012444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101751044 (or 101751042 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1221012444 is about 34942.9884812390. The cubic root of 1221012444 is about 1068.8252294365.

Adding to 1221012444 its reverse (4442101221), we get a palindrome (5663113665).

The spelling of 1221012444 in words is "one billion, two hundred twenty-one million, twelve thousand, four hundred forty-four".