213203765 has 4 divisors (see below), whose sum is σ = 255844524. Its totient is φ = 170563008.

The previous prime is 213203759. The next prime is 213203773. The reversal of 213203765 is 567302312.

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 137757169 + 75446596 = 11737^2 + 8686^2 .

It is a cyclic number.

It is not a de Polignac number, because 213203765 - 2¹⁰ = 213202741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21320372 + ... + 21320381.

It is an arithmetic number, because the mean of its divisors is an integer number (63961131).

Almost surely, 2^213203765 is an apocalyptic number.

It is an amenable number.

213203765 is a deficient number, since it is larger than the sum of its proper divisors (42640759).

213203765 is an equidigital number, since it uses as much as digits as its factorization.

213203765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42640758.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 213203765 is about 14601.4987244461. The cubic root of 213203765 is about 597.3996400126.

The spelling of 213203765 in words is "two hundred thirteen million, two hundred three thousand, seven hundred sixty-five".