21002541522 has 16 divisors (see below), whose sum is σ = 42035827392. Its totient is φ = 6995723120.

The previous prime is 21002541493. The next prime is 21002541533. The reversal of 21002541522 is 22514520012.

It is a super-2 number, since 2×21002541522² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002541492 and 21002541501.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1272129 + ... + 1288532.

It is an arithmetic number, because the mean of its divisors is an integer number (2627239212).

Almost surely, 2^21002541522 is an apocalyptic number.

21002541522 is an abundant number, since it is smaller than the sum of its proper divisors (21033285870).

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

21002541522 is a wasteful number, since it uses less digits than its factorization.

21002541522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562033.

The product of its (nonzero) digits is 1600, while the sum is 24.

The spelling of 21002541522 in words is "twenty-one billion, two million, five hundred forty-one thousand, five hundred twenty-two".