1221601445460 has 96 divisors (see below), whose sum is σ = 4146041289600. Its totient is φ = 296145803520.

The previous prime is 1221601445453. The next prime is 1221601445479. The reversal of 1221601445460 is 645441061221.

1221601445460 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 601 + 4 + 4 + 5 + 46 + 0 = 666.

It is a super-2 number, since 2×1221601445460² (a number of 25 digits) contains 22 as substring.

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

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, 102822465 + ... + 102834344.

It is an arithmetic number, because the mean of its divisors is an integer number (43187930100).

Almost surely, 2^{1221601445460} is an apocalyptic number.

1221601445460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221601445460 is an abundant number, since it is smaller than the sum of its proper divisors (2924439844140).

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

1221601445460 is a wasteful number, since it uses less digits than its factorization.

1221601445460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205656838 (or 205656830 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 1221601445460 in words is "one trillion, two hundred twenty-one billion, six hundred one million, four hundred forty-five thousand, four hundred sixty".