1221030945090 has 48 divisors (see below), whose sum is σ = 3463287774336. Its totient is φ = 296007501600.

The previous prime is 1221030945089. The next prime is 1221030945091. The reversal of 1221030945090 is 905490301221.

1221030945090 is a `hidden beast` number, since 1 + 2 + 210 + 309 + 4 + 50 + 90 = 666.

It is an interprime number because it is at equal distance from previous prime (1221030945089) and next prime (1221030945091).

It is a super-4 number, since 4×1221030945090⁴ (a number of 49 digits) contains 4444 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221030945091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 616681306 + ... + 616683285.

It is an arithmetic number, because the mean of its divisors is an integer number (72151828632).

Almost surely, 2^{1221030945090} is an apocalyptic number.

1221030945090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221030945090 is an abundant number, since it is smaller than the sum of its proper divisors (2242256829246).

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

1221030945090 is a wasteful number, since it uses less digits than its factorization.

1221030945090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233364615 (or 1233364612 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The spelling of 1221030945090 in words is "one trillion, two hundred twenty-one billion, thirty million, nine hundred forty-five thousand, ninety".