215455213 has 4 divisors (see below), whose sum is σ = 215510368. Its totient is φ = 215400060.

The previous prime is 215455211. The next prime is 215455243. The reversal of 215455213 is 312554512.

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 215455213 - 2¹ = 215455211 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 (215455211) 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, 21231 + ... + 29692.

It is an arithmetic number, because the mean of its divisors is an integer number (53877592).

Almost surely, 2^215455213 is an apocalyptic number.

It is an amenable number.

215455213 is a deficient number, since it is larger than the sum of its proper divisors (55155).

215455213 is an equidigital number, since it uses as much as digits as its factorization.

215455213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55154.

The product of its digits is 6000, while the sum is 28.

The square root of 215455213 is about 14678.3927253634. The cubic root of 215455213 is about 599.4951429106.

The spelling of 215455213 in words is "two hundred fifteen million, four hundred fifty-five thousand, two hundred thirteen".