213504345 has 24 divisors (see below), whose sum is σ = 370600776. Its totient is φ = 113707008.

The previous prime is 213504337. The next prime is 213504353. The reversal of 213504345 is 543405312.

It is an interprime number because it is at equal distance from previous prime (213504337) and next prime (213504353).

It can be written as a sum of positive squares in 4 ways, for example, as 227529 + 213276816 = 477^2 + 14604^2 .

It is not a de Polignac number, because 213504345 - 2³ = 213504337 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32889 + ... + 38841.

It is an arithmetic number, because the mean of its divisors is an integer number (15441699).

Almost surely, 2^213504345 is an apocalyptic number.

It is an amenable number.

213504345 is a deficient number, since it is larger than the sum of its proper divisors (157096431).

213504345 is a wasteful number, since it uses less digits than its factorization.

213504345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6761 (or 6758 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 213504345 is about 14611.7878782851. The cubic root of 213504345 is about 597.6802511674.

Adding to 213504345 its reverse (543405312), we get a palindrome (756909657).

The spelling of 213504345 in words is "two hundred thirteen million, five hundred four thousand, three hundred forty-five".