206621421610 has 32 divisors (see below), whose sum is σ = 388118200320. Its totient is φ = 79049190528.

The previous prime is 206621421569. The next prime is 206621421613. The reversal of 206621421610 is 16124126602.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (206621421613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4135639 + ... + 4185301.

It is an arithmetic number, because the mean of its divisors is an integer number (12128693760).

Almost surely, 2^206621421610 is an apocalyptic number.

206621421610 is a deficient number, since it is larger than the sum of its proper divisors (181496778710).

206621421610 is a wasteful number, since it uses less digits than its factorization.

206621421610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67782.

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 206621421610 in words is "two hundred six billion, six hundred twenty-one million, four hundred twenty-one thousand, six hundred ten".