208067042921 has 4 divisors (see below), whose sum is σ = 210011594832. Its totient is φ = 206122491012.

The previous prime is 208067042899. The next prime is 208067042929. The reversal of 208067042921 is 129240760802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129240760802 = 2 ⋅64620380401.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208067042921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208067042929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 972275795 + ... + 972276008.

It is an arithmetic number, because the mean of its divisors is an integer number (52502898708).

Almost surely, 2^208067042921 is an apocalyptic number.

It is an amenable number.

208067042921 is a deficient number, since it is larger than the sum of its proper divisors (1944551911).

208067042921 is a wasteful number, since it uses less digits than its factorization.

208067042921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944551910.

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 208067042921 in words is "two hundred eight billion, sixty-seven million, forty-two thousand, nine hundred twenty-one".