201521016 has 24 divisors (see below), whose sum is σ = 545786280. Its totient is φ = 67173648.

The previous prime is 201520967. The next prime is 201521039. The reversal of 201521016 is 610125102.

201521016 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×201521016² = 81221439779344512, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 201521016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1399380 + ... + 1399523.

It is an arithmetic number, because the mean of its divisors is an integer number (22741095).

Almost surely, 2^201521016 is an apocalyptic number.

It is an amenable number.

201521016 is an abundant number, since it is smaller than the sum of its proper divisors (344265264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201521016 is a wasteful number, since it uses less digits than its factorization.

201521016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2798915 (or 2798908 counting only the distinct ones).

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

The square root of 201521016 is about 14195.8098043049. The cubic root of 201521016 is about 586.2822978707.

Adding to 201521016 its reverse (610125102), we get a palindrome (811646118).

The spelling of 201521016 in words is "two hundred one million, five hundred twenty-one thousand, sixteen".