214405621 has 4 divisors (see below), whose sum is σ = 214497612. Its totient is φ = 214313632.

The previous prime is 214405619. The next prime is 214405651. The reversal of 214405621 is 126504412.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 112678225 + 101727396 = 10615^2 + 10086^2 .

It is a cyclic number.

It is not a de Polignac number, because 214405621 - 2¹ = 214405619 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 (214405651) 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, 42406 + ... + 47191.

It is an arithmetic number, because the mean of its divisors is an integer number (53624403).

Almost surely, 2^214405621 is an apocalyptic number.

It is an amenable number.

214405621 is a deficient number, since it is larger than the sum of its proper divisors (91991).

214405621 is an equidigital number, since it uses as much as digits as its factorization.

214405621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91990.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 214405621 is about 14642.5961154435. The cubic root of 214405621 is about 598.5200758569.

The spelling of 214405621 in words is "two hundred fourteen million, four hundred five thousand, six hundred twenty-one".