1221440053552 has 20 divisors (see below), whose sum is σ = 2491094846680. Its totient is φ = 578576867328.

The previous prime is 1221440053549. The next prime is 1221440053583. The reversal of 1221440053552 is 2553500441221.

It is a happy number.

It is a super-2 number, since 2×1221440053552² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2008947153 + ... + 2008947760.

It is an arithmetic number, because the mean of its divisors is an integer number (124554742334).

Almost surely, 2^{1221440053552} is an apocalyptic number.

It is an amenable number.

1221440053552 is an abundant number, since it is smaller than the sum of its proper divisors (1269654793128).

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

1221440053552 is a wasteful number, since it uses less digits than its factorization.

1221440053552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4017894940 (or 4017894934 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 1221440053552 its reverse (2553500441221), we get a palindrome (3774940494773).

The spelling of 1221440053552 in words is "one trillion, two hundred twenty-one billion, four hundred forty million, fifty-three thousand, five hundred fifty-two".