213253405 has 4 divisors (see below), whose sum is σ = 255904092. Its totient is φ = 170602720.

The previous prime is 213253393. The next prime is 213253421. The reversal of 213253405 is 504352312.

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 64096036 + 149157369 = 8006^2 + 12213^2 .

It is not a de Polignac number, because 213253405 - 2⁵ = 213253373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213253405.

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, 21325336 + ... + 21325345.

It is an arithmetic number, because the mean of its divisors is an integer number (63976023).

Almost surely, 2^213253405 is an apocalyptic number.

It is an amenable number.

213253405 is a deficient number, since it is larger than the sum of its proper divisors (42650687).

213253405 is an equidigital number, since it uses as much as digits as its factorization.

213253405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42650686.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 213253405 is about 14603.1984510244. The cubic root of 213253405 is about 597.4460003836.

The spelling of 213253405 in words is "two hundred thirteen million, two hundred fifty-three thousand, four hundred five".