221466398340 has 48 divisors (see below), whose sum is σ = 676479182400. Its totient is φ = 53688823680.

The previous prime is 221466398327. The next prime is 221466398341. The reversal of 221466398340 is 43893664122.

It is a self number, because there is not a number n which added to its sum of digits gives 221466398340.

It is not an unprimeable number, because it can be changed into a prime (221466398341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167776915 + ... + 167778234.

It is an arithmetic number, because the mean of its divisors is an integer number (14093316300).

Almost surely, 2^221466398340 is an apocalyptic number.

221466398340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221466398340 is an abundant number, since it is smaller than the sum of its proper divisors (455012784060).

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

221466398340 is a wasteful number, since it uses less digits than its factorization.

221466398340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335555172 (or 335555170 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 48.

The spelling of 221466398340 in words is "two hundred twenty-one billion, four hundred sixty-six million, three hundred ninety-eight thousand, three hundred forty".