2213981 has 8 divisors (see below), whose sum is σ = 2760384. Its totient is φ = 1725120.

The previous prime is 2213977. The next prime is 2213983. The reversal of 2213981 is 1893122.

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

It is a cyclic number.

It is not a de Polignac number, because 2213981 - 2² = 2213977 is a prime.

It is a super-2 number, since 2×2213981² = 9803423736722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2213981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2213983) 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, 14300 + ... + 14453.

It is an arithmetic number, because the mean of its divisors is an integer number (345048).

2^2213981 is an apocalyptic number.

It is an amenable number.

2213981 is a deficient number, since it is larger than the sum of its proper divisors (546403).

2213981 is a wasteful number, since it uses less digits than its factorization.

2213981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28771.

The product of its digits is 864, while the sum is 26.

The square root of 2213981 is about 1487.9452274865. The cubic root of 2213981 is about 130.3340717393.

It can be divided in two parts, 221 and 3981, that multiplied together give a triangular number (879801 = T₁₃₂₆).

The spelling of 2213981 in words is "two million, two hundred thirteen thousand, nine hundred eighty-one".