213401615 has 12 divisors (see below), whose sum is σ = 297891576. Its totient is φ = 146332368.

The previous prime is 213401611. The next prime is 213401627. The reversal of 213401615 is 516104312.

It is not a de Polignac number, because 213401615 - 2² = 213401611 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 (213401611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 435269 + ... + 435758.

It is an arithmetic number, because the mean of its divisors is an integer number (24824298).

Almost surely, 2^213401615 is an apocalyptic number.

213401615 is a deficient number, since it is larger than the sum of its proper divisors (84489961).

213401615 is an equidigital number, since it uses as much as digits as its factorization.

213401615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871046 (or 871039 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 213401615 is about 14608.2721428648. The cubic root of 213401615 is about 597.5843756126.

Adding to 213401615 its reverse (516104312), we get a palindrome (729505927).

The spelling of 213401615 in words is "two hundred thirteen million, four hundred one thousand, six hundred fifteen".