213144015 has 32 divisors (see below), whose sum is σ = 391412736. Its totient is φ = 97021440.

The previous prime is 213143999. The next prime is 213144047. The reversal of 213144015 is 510441312.

It is not a de Polignac number, because 213144015 - 2⁴ = 213143999 is a prime.

It is a super-2 number, since 2×213144015² = 90860742260640450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 213143982 and 213144000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21094 + ... + 29516.

It is an arithmetic number, because the mean of its divisors is an integer number (12231648).

Almost surely, 2^213144015 is an apocalyptic number.

213144015 is a deficient number, since it is larger than the sum of its proper divisors (178268721).

213144015 is a wasteful number, since it uses less digits than its factorization.

213144015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8679.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 213144015 is about 14599.4525582297. The cubic root of 213144015 is about 597.3438280472.

Adding to 213144015 its reverse (510441312), we get a palindrome (723585327).

The spelling of 213144015 in words is "two hundred thirteen million, one hundred forty-four thousand, fifteen".