1221440123140 has 48 divisors (see below), whose sum is σ = 2636234496000. Its totient is φ = 475031094912.

The previous prime is 1221440123089. The next prime is 1221440123159. The reversal of 1221440123140 is 413210441221.

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, 445341 + ... + 1625179.

It is an arithmetic number, because the mean of its divisors is an integer number (54921552000).

Almost surely, 2^{1221440123140} is an apocalyptic number.

1221440123140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221440123140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1318117248000).

1221440123140 is an abundant number, since it is smaller than the sum of its proper divisors (1414794372860).

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

1221440123140 is a wasteful number, since it uses less digits than its factorization.

1221440123140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181284 (or 1181282 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 1221440123140 its reverse (413210441221), we get a palindrome (1634650564361).

The spelling of 1221440123140 in words is "one trillion, two hundred twenty-one billion, four hundred forty million, one hundred twenty-three thousand, one hundred forty".