1223421555040 has 192 divisors, whose sum is σ = 3117701664000. Its totient is φ = 452266813440.

The previous prime is 1223421555011. The next prime is 1223421555049. The reversal of 1223421555040 is 405551243221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1223421554987 and 1223421555005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223421555049) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23470126 + ... + 23522194.

It is an arithmetic number, because the mean of its divisors is an integer number (16238029500).

Almost surely, 2^{1223421555040} is an apocalyptic number.

1223421555040 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 1223421555040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1558850832000).

1223421555040 is an abundant number, since it is smaller than the sum of its proper divisors (1894280108960).

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

1223421555040 is a wasteful number, since it uses less digits than its factorization.

1223421555040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52293 (or 52285 counting only the distinct ones).

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

Adding to 1223421555040 its reverse (405551243221), we get a palindrome (1628972798261).

The spelling of 1223421555040 in words is "one trillion, two hundred twenty-three billion, four hundred twenty-one million, five hundred fifty-five thousand, forty".