213406223515 has 4 divisors (see below), whose sum is σ = 256087468224. Its totient is φ = 170724978808.

The previous prime is 213406223501. The next prime is 213406223543. The reversal of 213406223515 is 515322604312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213406223515 - 2⁹ = 213406223003 is a prime.

It is a Duffinian 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, 21340622347 + ... + 21340622356.

It is an arithmetic number, because the mean of its divisors is an integer number (64021867056).

Almost surely, 2^213406223515 is an apocalyptic number.

213406223515 is a deficient number, since it is larger than the sum of its proper divisors (42681244709).

213406223515 is an equidigital number, since it uses as much as digits as its factorization.

213406223515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42681244708.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 213406223515 its reverse (515322604312), we get a palindrome (728728827827).

It can be divided in two parts, 213406 and 223515, that added together give a square (436921 = 661²).

The spelling of 213406223515 in words is "two hundred thirteen billion, four hundred six million, two hundred twenty-three thousand, five hundred fifteen".