1221150774600 has 288 divisors, whose sum is σ = 4465736496000. Its totient is φ = 297863032320.

The previous prime is 1221150774583. The next prime is 1221150774763. The reversal of 1221150774600 is 64770511221.

1221150774600 is a `hidden beast` number, since 1 + 2 + 21 + 1 + 507 + 74 + 60 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 376177 + ... + 1607423.

It is an arithmetic number, because the mean of its divisors is an integer number (15506029500).

Almost surely, 2^{1221150774600} is an apocalyptic number.

1221150774600 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 1221150774600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2232868248000).

1221150774600 is an abundant number, since it is smaller than the sum of its proper divisors (3244585721400).

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

1221150774600 is a wasteful number, since it uses less digits than its factorization.

1221150774600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231317 (or 1231305 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The spelling of 1221150774600 in words is "one trillion, two hundred twenty-one billion, one hundred fifty million, seven hundred seventy-four thousand, six hundred".