1221023315424 has 96 divisors (see below), whose sum is σ = 3617138125440. Its totient is φ = 357248192000.

The previous prime is 1221023315381. The next prime is 1221023315459. The reversal of 1221023315424 is 4245133201221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 1221023315391 and 1221023315400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19905102 + ... + 19966349.

It is an arithmetic number, because the mean of its divisors is an integer number (37678522140).

Almost surely, 2^{1221023315424} is an apocalyptic number.

It is an amenable number.

1221023315424 is an abundant number, since it is smaller than the sum of its proper divisors (2396114810016).

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

1221023315424 is a wasteful number, since it uses less digits than its factorization.

1221023315424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39871504 (or 39871496 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 1221023315424 its reverse (4245133201221), we get a palindrome (5466156516645).

The spelling of 1221023315424 in words is "one trillion, two hundred twenty-one billion, twenty-three million, three hundred fifteen thousand, four hundred twenty-four".