16213261 has 4 divisors (see below), whose sum is σ = 16558272. Its totient is φ = 15868252.

The previous prime is 16213247. The next prime is 16213273. The reversal of 16213261 is 16231261.

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 16213261 - 2¹¹ = 16211213 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 (16216261) 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, 172435 + ... + 172528.

It is an arithmetic number, because the mean of its divisors is an integer number (4139568).

Almost surely, 2^16213261 is an apocalyptic number.

It is an amenable number.

16213261 is a deficient number, since it is larger than the sum of its proper divisors (345011).

16213261 is an equidigital number, since it uses as much as digits as its factorization.

16213261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345010.

The product of its digits is 432, while the sum is 22.

The square root of 16213261 is about 4026.5693834827. The cubic root of 16213261 is about 253.0988224923.

The spelling of 16213261 in words is "sixteen million, two hundred thirteen thousand, two hundred sixty-one".