213400045 has 4 divisors (see below), whose sum is σ = 256080060. Its totient is φ = 170720032.

The previous prime is 213400043. The next prime is 213400081. The reversal of 213400045 is 540004312.

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 126742564 + 86657481 = 11258^2 + 9309^2 .

It is a cyclic number.

It is not a de Polignac number, because 213400045 - 2¹ = 213400043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213399995 and 213400031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213400043) 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, 21340000 + ... + 21340009.

It is an arithmetic number, because the mean of its divisors is an integer number (64020015).

Almost surely, 2^213400045 is an apocalyptic number.

It is an amenable number.

213400045 is a deficient number, since it is larger than the sum of its proper divisors (42680015).

213400045 is an equidigital number, since it uses as much as digits as its factorization.

213400045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42680014.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 213400045 is about 14608.2184060891. The cubic root of 213400045 is about 597.5829101289.

Adding to 213400045 its reverse (540004312), we get a palindrome (753404357).

The spelling of 213400045 in words is "two hundred thirteen million, four hundred thousand, forty-five".