217429740146 has 16 divisors (see below), whose sum is σ = 346013352960. Its totient is φ = 102182063760.

The previous prime is 217429740139. The next prime is 217429740181. The reversal of 217429740146 is 641047924712.

It is a self number, because there is not a number n which added to its sum of digits gives 217429740146.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22522085 + ... + 22531736.

It is an arithmetic number, because the mean of its divisors is an integer number (21625834560).

Almost surely, 2^217429740146 is an apocalyptic number.

217429740146 is a deficient number, since it is larger than the sum of its proper divisors (128583612814).

217429740146 is a wasteful number, since it uses less digits than its factorization.

217429740146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45053969.

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 217429740146 in words is "two hundred seventeen billion, four hundred twenty-nine million, seven hundred forty thousand, one hundred forty-six".