213276521 has 4 divisors (see below), whose sum is σ = 214393344. Its totient is φ = 212159700.

The previous prime is 213276491. The next prime is 213276523. The reversal of 213276521 is 125672312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213276521 - 2¹⁴ = 213260137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213276523) 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, 558125 + ... + 558506.

It is an arithmetic number, because the mean of its divisors is an integer number (53598336).

Almost surely, 2^213276521 is an apocalyptic number.

It is an amenable number.

213276521 is a deficient number, since it is larger than the sum of its proper divisors (1116823).

213276521 is a wasteful number, since it uses less digits than its factorization.

213276521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116822.

The product of its digits is 5040, while the sum is 29.

The square root of 213276521 is about 14603.9899000239. The cubic root of 213276521 is about 597.4675866943.

The spelling of 213276521 in words is "two hundred thirteen million, two hundred seventy-six thousand, five hundred twenty-one".