1217221966530 has 48 divisors (see below), whose sum is σ = 3192784016760. Its totient is φ = 321720021504.

The previous prime is 1217221966523. The next prime is 1217221966561. The reversal of 1217221966530 is 356691227121.

1217221966530 is a `hidden beast` number, since 1 + 2 + 1 + 7 + 2 + 21 + 96 + 6 + 530 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 797150765889 + 420071200641 = 892833^2 + 648129^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59833585 + ... + 59853924.

Almost surely, 2^{1217221966530} is an apocalyptic number.

1217221966530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1217221966530 is an abundant number, since it is smaller than the sum of its proper divisors (1975562050230).

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

1217221966530 is a wasteful number, since it uses less digits than its factorization.

1217221966530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119687635 (or 119687632 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 1217221966530 in words is "one trillion, two hundred seventeen billion, two hundred twenty-one million, nine hundred sixty-six thousand, five hundred thirty".