2218918971 has 16 divisors (see below), whose sum is σ = 3198444800. Its totient is φ = 1363544928.

The previous prime is 2218918969. The next prime is 2218918973. The reversal of 2218918971 is 1798198122.

It is an interprime number because it is at equal distance from previous prime (2218918969) and next prime (2218918973).

It is not a de Polignac number, because 2218918971 - 2¹ = 2218918969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2218918971.

It is not an unprimeable number, because it can be changed into a prime (2218918973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 523951 + ... + 528168.

It is an arithmetic number, because the mean of its divisors is an integer number (199902800).

Almost surely, 2^2218918971 is an apocalyptic number.

2218918971 is a deficient number, since it is larger than the sum of its proper divisors (979525829).

2218918971 is a wasteful number, since it uses less digits than its factorization.

2218918971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052178.

The product of its digits is 145152, while the sum is 48.

The square root of 2218918971 is about 47105.4027792991. The cubic root of 2218918971 is about 1304.3089701816.

The spelling of 2218918971 in words is "two billion, two hundred eighteen million, nine hundred eighteen thousand, nine hundred seventy-one".