1221220012384 has 24 divisors (see below), whose sum is σ = 2404456622568. Its totient is φ = 610564362240.

The previous prime is 1221220012381. The next prime is 1221220012391. The reversal of 1221220012384 is 4832100221221.

It is a super-2 number, since 2×1221220012384² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221220012381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 989542 + ... + 1849765.

It is an arithmetic number, because the mean of its divisors is an integer number (100185692607).

Almost surely, 2^{1221220012384} is an apocalyptic number.

It is an amenable number.

1221220012384 is a deficient number, since it is larger than the sum of its proper divisors (1183236610184).

1221220012384 is a wasteful number, since it uses less digits than its factorization.

1221220012384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2852758 (or 2852750 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The spelling of 1221220012384 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, twelve thousand, three hundred eighty-four".