1221513112424 has 16 divisors (see below), whose sum is σ = 2498549548320. Its totient is φ = 555233232880.

The previous prime is 1221513112373. The next prime is 1221513112441. The reversal of 1221513112424 is 4242113151221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6940415324 + ... + 6940415499.

It is an arithmetic number, because the mean of its divisors is an integer number (156159346770).

Almost surely, 2^{1221513112424} is an apocalyptic number.

It is an amenable number.

1221513112424 is an abundant number, since it is smaller than the sum of its proper divisors (1277036435896).

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

1221513112424 is a wasteful number, since it uses less digits than its factorization.

1221513112424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13880830840 (or 13880830836 counting only the distinct ones).

The product of its digits is 3840, while the sum is 29.

Adding to 1221513112424 its reverse (4242113151221), we get a palindrome (5463626263645).

The spelling of 1221513112424 in words is "one trillion, two hundred twenty-one billion, five hundred thirteen million, one hundred twelve thousand, four hundred twenty-four".