221656472466460 has 24 divisors (see below), whose sum is σ = 466515292849200. Its totient is φ = 88465122192384.

The previous prime is 221656472466437. The next prime is 221656472466469. The reversal of 221656472466460 is 64664274656122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221656472466469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12341665434 + ... + 12341683393.

It is an arithmetic number, because the mean of its divisors is an integer number (19438137202050).

Almost surely, 2^{221656472466460} is an apocalyptic number.

221656472466460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221656472466460 is an abundant number, since it is smaller than the sum of its proper divisors (244858820382740).

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

221656472466460 is a wasteful number, since it uses less digits than its factorization.

221656472466460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24683349285 (or 24683349283 counting only the distinct ones).

The product of its (nonzero) digits is 139345920, while the sum is 61.

The spelling of 221656472466460 in words is "two hundred twenty-one trillion, six hundred fifty-six billion, four hundred seventy-two million, four hundred sixty-six thousand, four hundred sixty".