1221067563760 has 160 divisors (see below), whose sum is σ = 3139529057280. Its totient is φ = 437949158400.

The previous prime is 1221067563743. The next prime is 1221067563799. The reversal of 1221067563760 is 673657601221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221067563760.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70971319 + ... + 70988521.

It is an arithmetic number, because the mean of its divisors is an integer number (19622056608).

Almost surely, 2^{1221067563760} is an apocalyptic number.

1221067563760 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 1221067563760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1569764528640).

1221067563760 is an abundant number, since it is smaller than the sum of its proper divisors (1918461493520).

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

1221067563760 is a wasteful number, since it uses less digits than its factorization.

1221067563760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18327 (or 18321 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 46.

The spelling of 1221067563760 in words is "one trillion, two hundred twenty-one billion, sixty-seven million, five hundred sixty-three thousand, seven hundred sixty".