1221885923328 has 312 divisors, whose sum is σ = 4038612259968. Its totient is φ = 348682715136.

The previous prime is 1221885923257. The next prime is 1221885923369. The reversal of 1221885923328 is 8233295881221.

1221885923328 is a `hidden beast` number, since 1 + 2 + 2 + 18 + 8 + 592 + 3 + 32 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 253658776 + ... + 253663592.

It is an arithmetic number, because the mean of its divisors is an integer number (12944270064).

Almost surely, 2^{1221885923328} is an apocalyptic number.

1221885923328 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 1221885923328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2019306129984).

1221885923328 is an abundant number, since it is smaller than the sum of its proper divisors (2816726336640).

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

1221885923328 is an equidigital number, since it uses as much as digits as its factorization.

1221885923328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5837 (or 5812 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 54.

The spelling of 1221885923328 in words is "one trillion, two hundred twenty-one billion, eight hundred eighty-five million, nine hundred twenty-three thousand, three hundred twenty-eight".