1221050186730 has 128 divisors (see below), whose sum is σ = 3564789523200. Its totient is φ = 294958540800.

The previous prime is 1221050186701. The next prime is 1221050186749. The reversal of 1221050186730 is 376810501221.

1221050186730 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 0 + 501 + 86 + 73 + 0 = 666.

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, 103026 + ... + 1566114.

It is an arithmetic number, because the mean of its divisors is an integer number (27849918150).

Almost surely, 2^{1221050186730} is an apocalyptic number.

1221050186730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221050186730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1782394761600).

1221050186730 is an abundant number, since it is smaller than the sum of its proper divisors (2343739336470).

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

1221050186730 is a wasteful number, since it uses less digits than its factorization.

1221050186730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1463397 (or 1463391 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

Adding to 1221050186730 its reverse (376810501221), we get a palindrome (1597860687951).

The spelling of 1221050186730 in words is "one trillion, two hundred twenty-one billion, fifty million, one hundred eighty-six thousand, seven hundred thirty".