214216981 has 4 divisors (see below), whose sum is σ = 233691264. Its totient is φ = 194742700.

The previous prime is 214216979. The next prime is 214216999. The reversal of 214216981 is 189612412.

It is a happy number.

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 214216981 - 2¹ = 214216979 is a prime.

It is a super-2 number, since 2×214216981² = 91777829897508722, 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 (214216901) 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, 9737125 + ... + 9737146.

It is an arithmetic number, because the mean of its divisors is an integer number (58422816).

Almost surely, 2^214216981 is an apocalyptic number.

It is an amenable number.

214216981 is a deficient number, since it is larger than the sum of its proper divisors (19474283).

214216981 is a wasteful number, since it uses less digits than its factorization.

214216981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19474282.

The product of its digits is 6912, while the sum is 34.

The square root of 214216981 is about 14636.1532172904. The cubic root of 214216981 is about 598.3444928427.

The spelling of 214216981 in words is "two hundred fourteen million, two hundred sixteen thousand, nine hundred eighty-one".