1221552103068 has 192 divisors, whose sum is σ = 3490884633600. Its totient is φ = 366316369920.

The previous prime is 1221552103067. The next prime is 1221552103099. The reversal of 1221552103068 is 8603012551221.

1221552103068 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 552 + 10 + 30 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221552103067) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 243868948 + ... + 243873956.

It is an arithmetic number, because the mean of its divisors is an integer number (18181690800).

Almost surely, 2^{1221552103068} is an apocalyptic number.

1221552103068 is a gapful number since it is divisible by the number (18) 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 1221552103068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1745442316800).

1221552103068 is an abundant number, since it is smaller than the sum of its proper divisors (2269332530532).

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

1221552103068 is a wasteful number, since it uses less digits than its factorization.

1221552103068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7129 (or 7121 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

Adding to 1221552103068 its reverse (8603012551221), we get a palindrome (9824564654289).

The spelling of 1221552103068 in words is "one trillion, two hundred twenty-one billion, five hundred fifty-two million, one hundred three thousand, sixty-eight".