221660146622732 has 12 divisors (see below), whose sum is σ = 387909894915816. Its totient is φ = 110828748075360.

The previous prime is 221660146622701. The next prime is 221660146622779. The reversal of 221660146622732 is 237226641066122.

It is a super-2 number, since 2×221660146622732² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330932618 + ... + 331601745.

It is an arithmetic number, because the mean of its divisors is an integer number (32325824576318).

Almost surely, 2^{221660146622732} is an apocalyptic number.

It is an amenable number.

221660146622732 is a deficient number, since it is larger than the sum of its proper divisors (166249748293084).

221660146622732 is a wasteful number, since it uses less digits than its factorization.

221660146622732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662618008 (or 662618006 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 50.

Adding to 221660146622732 its reverse (237226641066122), we get a palindrome (458886787688854).

The spelling of 221660146622732 in words is "two hundred twenty-one trillion, six hundred sixty billion, one hundred forty-six million, six hundred twenty-two thousand, seven hundred thirty-two".