215211161 has 8 divisors (see below), whose sum is σ = 244983744. Its totient is φ = 187139920.

The previous prime is 215211151. The next prime is 215211181. The reversal of 215211161 is 161112512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 215211161 - 2¹⁸ = 214949017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215211121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425066 + ... + 425571.

It is an arithmetic number, because the mean of its divisors is an integer number (30622968).

Almost surely, 2^215211161 is an apocalyptic number.

It is an amenable number.

215211161 is a deficient number, since it is larger than the sum of its proper divisors (29772583).

215211161 is a wasteful number, since it uses less digits than its factorization.

215211161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850671.

The product of its digits is 120, while the sum is 20.

The square root of 215211161 is about 14670.0770618290. The cubic root of 215211161 is about 599.2687025541.

Adding to 215211161 its reverse (161112512), we get a palindrome (376323673).

The spelling of 215211161 in words is "two hundred fifteen million, two hundred eleven thousand, one hundred sixty-one".