1221755570000 has 200 divisors, whose sum is σ = 3489619364352. Its totient is φ = 405374400000.

The previous prime is 1221755569997. The next prime is 1221755570017. The reversal of 1221755570000 is 755571221.

It is a tau number, because it is divible by the number of its divisors (200).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1888490 + ... + 2451510.

Almost surely, 2^{1221755570000} is an apocalyptic number.

1221755570000 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 1221755570000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1744809682176).

1221755570000 is an abundant number, since it is smaller than the sum of its proper divisors (2267863794352).

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

1221755570000 is an equidigital number, since it uses as much as digits as its factorization.

1221755570000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563087 (or 563066 counting only the distinct ones).

The product of its (nonzero) digits is 24500, while the sum is 35.

The spelling of 1221755570000 in words is "one trillion, two hundred twenty-one billion, seven hundred fifty-five million, five hundred seventy thousand".