201387721206 has 48 divisors (see below), whose sum is σ = 470598883776. Its totient is φ = 57285852624.

The previous prime is 201387721187. The next prime is 201387721237. The reversal of 201387721206 is 602127783102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1442056 + ... + 1575531.

It is an arithmetic number, because the mean of its divisors is an integer number (9804143412).

Almost surely, 2^201387721206 is an apocalyptic number.

201387721206 is an abundant number, since it is smaller than the sum of its proper divisors (269211162570).

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

201387721206 is a wasteful number, since it uses less digits than its factorization.

201387721206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3017833 (or 3017826 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The spelling of 201387721206 in words is "two hundred one billion, three hundred eighty-seven million, seven hundred twenty-one thousand, two hundred six".