221603146461 has 32 divisors (see below), whose sum is σ = 346847731200. Its totient is φ = 139606165440.

The previous prime is 221603146433. The next prime is 221603146561. The reversal of 221603146461 is 164641306122.

221603146461 is a `hidden beast` number, since 2 + 2 + 1 + 6 + 0 + 3 + 1 + 4 + 646 + 1 = 666.

It is not a de Polignac number, because 221603146461 - 2⁶ = 221603146397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221603146561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2974030 + ... + 3047631.

It is an arithmetic number, because the mean of its divisors is an integer number (10838991600).

Almost surely, 2^221603146461 is an apocalyptic number.

It is an amenable number.

221603146461 is a deficient number, since it is larger than the sum of its proper divisors (125244584739).

221603146461 is a wasteful number, since it uses less digits than its factorization.

221603146461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6021746 (or 6021740 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 221603146461 in words is "two hundred twenty-one billion, six hundred three million, one hundred forty-six thousand, four hundred sixty-one".