201516021 has 12 divisors (see below), whose sum is σ = 332661472. Its totient is φ = 115151976.

The previous prime is 201515981. The next prime is 201516043. The reversal of 201516021 is 120615102.

201516021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 201516021 - 2¹³ = 201507829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201515985 and 201516003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201516221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1599271 + ... + 1599396.

Almost surely, 2^201516021 is an apocalyptic number.

201516021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201516021 is a deficient number, since it is larger than the sum of its proper divisors (131145451).

201516021 is a wasteful number, since it uses less digits than its factorization.

201516021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3198680 (or 3198677 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 201516021 is about 14195.6338710182. The cubic root of 201516021 is about 586.2774538693.

The spelling of 201516021 in words is "two hundred one million, five hundred sixteen thousand, twenty-one".