1221102295380 has 480 divisors, whose sum is σ = 4302785152512. Its totient is φ = 287288985600.

The previous prime is 1221102295327. The next prime is 1221102295411. The reversal of 1221102295380 is 835922011221.

1221102295380 is a `hidden beast` number, since 1 + 2 + 2 + 110 + 2 + 2 + 9 + 538 + 0 = 666.

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 159 ways as a sum of consecutive naturals, for example, 284173392 + ... + 284177688.

Almost surely, 2^{1221102295380} is an apocalyptic number.

1221102295380 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 1221102295380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2151392576256).

1221102295380 is an abundant number, since it is smaller than the sum of its proper divisors (3081682857132).

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

1221102295380 is a wasteful number, since it uses less digits than its factorization.

1221102295380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4797 (or 4786 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 1221102295380 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred ninety-five thousand, three hundred eighty".