2021660216 has 32 divisors (see below), whose sum is σ = 3845394000. Its totient is φ = 996280320.

The previous prime is 2021660197. The next prime is 2021660219. The reversal of 2021660216 is 6120661202.

It is a super-2 number, since 2×2021660216² = 8174220057914333312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021660219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294746 + ... + 301526.

Almost surely, 2^2021660216 is an apocalyptic number.

It is an amenable number.

2021660216 is a deficient number, since it is larger than the sum of its proper divisors (1823733784).

2021660216 is a wasteful number, since it uses less digits than its factorization.

2021660216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7319 (or 7315 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2021660216 is about 44962.8759756313. The cubic root of 2021660216 is about 1264.4530885830.

The spelling of 2021660216 in words is "two billion, twenty-one million, six hundred sixty thousand, two hundred sixteen".