208221701 has 4 divisors (see below), whose sum is σ = 210283404. Its totient is φ = 206160000.

The previous prime is 208221667. The next prime is 208221709. The reversal of 208221701 is 107122802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 198077476 + 10144225 = 14074^2 + 3185^2 .

It is a cyclic number.

It is not a de Polignac number, because 208221701 - 2¹⁴ = 208205317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208221709) 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, 1030700 + ... + 1030901.

It is an arithmetic number, because the mean of its divisors is an integer number (52570851).

Almost surely, 2^208221701 is an apocalyptic number.

It is an amenable number.

208221701 is a deficient number, since it is larger than the sum of its proper divisors (2061703).

208221701 is a wasteful number, since it uses less digits than its factorization.

208221701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061702.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 208221701 is about 14429.8891541134. The cubic root of 208221701 is about 592.7096480176.

The spelling of 208221701 in words is "two hundred eight million, two hundred twenty-one thousand, seven hundred one".