2106016221 has 24 divisors (see below), whose sum is σ = 3061321120. Its totient is φ = 1284220224.

The previous prime is 2106016189. The next prime is 2106016249. The reversal of 2106016221 is 1226106012.

It is not a de Polignac number, because 2106016221 - 2⁵ = 2106016189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2106016721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25971 + ... + 69903.

Almost surely, 2^2106016221 is an apocalyptic number.

It is an amenable number.

2106016221 is a deficient number, since it is larger than the sum of its proper divisors (955304899).

2106016221 is a wasteful number, since it uses less digits than its factorization.

2106016221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44013 (or 43984 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 2106016221 is about 45891.3523553185. The cubic root of 2106016221 is about 1281.8008954219.

The spelling of 2106016221 in words is "two billion, one hundred six million, sixteen thousand, two hundred twenty-one".