1221440043412 has 96 divisors (see below), whose sum is σ = 2287320602112. Its totient is φ = 569518473216.

The previous prime is 1221440043391. The next prime is 1221440043503. The reversal of 1221440043412 is 2143400441221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168401178 + ... + 168408430.

It is an arithmetic number, because the mean of its divisors is an integer number (23826256272).

Almost surely, 2^{1221440043412} is an apocalyptic number.

It is an amenable number.

1221440043412 is a deficient number, since it is larger than the sum of its proper divisors (1065880558700).

1221440043412 is a wasteful number, since it uses less digits than its factorization.

1221440043412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7657 (or 7655 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 1221440043412 its reverse (2143400441221), we get a palindrome (3364840484633).

The spelling of 1221440043412 in words is "one trillion, two hundred twenty-one billion, four hundred forty million, forty-three thousand, four hundred twelve".