213780405206 has 16 divisors (see below), whose sum is σ = 338241154560. Its totient is φ = 101056458600.

The previous prime is 213780405127. The next prime is 213780405211. The reversal of 213780405206 is 602504087312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a self number, because there is not a number n which added to its sum of digits gives 213780405206.

It is a congruent number.

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, 5757470 + ... + 5794481.

It is an arithmetic number, because the mean of its divisors is an integer number (21140072160).

Almost surely, 2^213780405206 is an apocalyptic number.

213780405206 is a deficient number, since it is larger than the sum of its proper divisors (124460749354).

213780405206 is a wasteful number, since it uses less digits than its factorization.

213780405206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11552459.

The product of its (nonzero) digits is 80640, while the sum is 38.

The spelling of 213780405206 in words is "two hundred thirteen billion, seven hundred eighty million, four hundred five thousand, two hundred six".