212217151 has 4 divisors (see below), whose sum is σ = 212272632. Its totient is φ = 212161672.

The previous prime is 212217149. The next prime is 212217191. The reversal of 212217151 is 151712212.

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

It is a cyclic number.

It is not a de Polignac number, because 212217151 - 2¹ = 212217149 is a prime.

It is a super-2 number, since 2×212217151² = 90072238357113602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212217121) 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, 21541 + ... + 29806.

It is an arithmetic number, because the mean of its divisors is an integer number (53068158).

Almost surely, 2^212217151 is an apocalyptic number.

212217151 is a deficient number, since it is larger than the sum of its proper divisors (55481).

212217151 is an equidigital number, since it uses as much as digits as its factorization.

212217151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55480.

The product of its digits is 280, while the sum is 22.

The square root of 212217151 is about 14567.6748659489. The cubic root of 212217151 is about 596.4767132850.

Adding to 212217151 its reverse (151712212), we get a palindrome (363929363).

The spelling of 212217151 in words is "two hundred twelve million, two hundred seventeen thousand, one hundred fifty-one".