121321440544 has 48 divisors (see below), whose sum is σ = 253110312000. Its totient is φ = 57082316544.

The previous prime is 121321440529. The next prime is 121321440631. The reversal of 121321440544 is 445044123121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 579012 + ... + 760195.

It is an arithmetic number, because the mean of its divisors is an integer number (5273131500).

Almost surely, 2^121321440544 is an apocalyptic number.

It is an amenable number.

121321440544 is an abundant number, since it is smaller than the sum of its proper divisors (131788871456).

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

121321440544 is a wasteful number, since it uses less digits than its factorization.

121321440544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339385 (or 1339377 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

Adding to 121321440544 its reverse (445044123121), we get a palindrome (566365563665).

The spelling of 121321440544 in words is "one hundred twenty-one billion, three hundred twenty-one million, four hundred forty thousand, five hundred forty-four".