2021218564 has 24 divisors (see below), whose sum is σ = 3696013440. Its totient is φ = 965336064.

The previous prime is 2021218531. The next prime is 2021218567. The reversal of 2021218564 is 4658121202.

It is not an unprimeable number, because it can be changed into a prime (2021218567) 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, 53572 + ... + 83140.

It is an arithmetic number, because the mean of its divisors is an integer number (154000560).

Almost surely, 2^2021218564 is an apocalyptic number.

It is an amenable number.

2021218564 is a deficient number, since it is larger than the sum of its proper divisors (1674794876).

2021218564 is a wasteful number, since it uses less digits than its factorization.

2021218564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30339 (or 30337 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 2021218564 is about 44957.9644112142. The cubic root of 2021218564 is about 1264.3610043804.

Adding to 2021218564 its reverse (4658121202), we get a palindrome (6679339766).

The spelling of 2021218564 in words is "two billion, twenty-one million, two hundred eighteen thousand, five hundred sixty-four".