1221017071560 has 256 divisors, whose sum is σ = 4321465344000. Its totient is φ = 272090434560.

The previous prime is 1221017071559. The next prime is 1221017071613. The reversal of 1221017071560 is 651707101221.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3952381 + ... + 4250099.

It is an arithmetic number, because the mean of its divisors is an integer number (16880724000).

Almost surely, 2^{1221017071560} is an apocalyptic number.

1221017071560 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 1221017071560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2160732672000).

1221017071560 is an abundant number, since it is smaller than the sum of its proper divisors (3100448272440).

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

1221017071560 is a wasteful number, since it uses less digits than its factorization.

1221017071560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297996 (or 297992 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 33.

The spelling of 1221017071560 in words is "one trillion, two hundred twenty-one billion, seventeen million, seventy-one thousand, five hundred sixty".