221640472602 has 24 divisors (see below), whose sum is σ = 484709075136. Its totient is φ = 73189688136.

The previous prime is 221640472597. The next prime is 221640472607. The reversal of 221640472602 is 206274046122.

221640472602 is a `hidden beast` number, since 2 + 2 + 1 + 6 + 4 + 0 + 47 + 2 + 602 = 666.

221640472602 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221640472597) and next prime (221640472607).

It is not an unprimeable number, because it can be changed into a prime (221640472607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57537138 + ... + 57540989.

It is an arithmetic number, because the mean of its divisors is an integer number (20196211464).

Almost surely, 2^221640472602 is an apocalyptic number.

221640472602 is an abundant number, since it is smaller than the sum of its proper divisors (263068602534).

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

221640472602 is a wasteful number, since it uses less digits than its factorization.

221640472602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115078242 (or 115078239 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The spelling of 221640472602 in words is "two hundred twenty-one billion, six hundred forty million, four hundred seventy-two thousand, six hundred two".