2522016021 has 16 divisors (see below), whose sum is σ = 3845939328. Its totient is φ = 1440076800.

The previous prime is 2522016019. The next prime is 2522016023. The reversal of 2522016021 is 1206102252.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2522016019) and next prime (2522016023).

It is not a de Polignac number, because 2522016021 - 2¹ = 2522016019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2522016023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15540 + ... + 72701.

It is an arithmetic number, because the mean of its divisors is an integer number (240371208).

Almost surely, 2^2522016021 is an apocalyptic number.

2522016021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2522016021 is a deficient number, since it is larger than the sum of its proper divisors (1323923307).

2522016021 is a wasteful number, since it uses less digits than its factorization.

2522016021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89612.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 2522016021 is about 50219.6776274002. The cubic root of 2522016021 is about 1361.1812151552.

Adding to 2522016021 its reverse (1206102252), we get a palindrome (3728118273).

The spelling of 2522016021 in words is "two billion, five hundred twenty-two million, sixteen thousand, twenty-one".