21010524020 has 24 divisors (see below), whose sum is σ = 44845416168. Its totient is φ = 8266435200.

The previous prime is 21010523999. The next prime is 21010524089. The reversal of 21010524020 is 2042501012.

It can be written as a sum of positive squares in 4 ways, for example, as 1868141284 + 19142382736 = 43222^2 + 138356^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21010524020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8609651 + ... + 8612090.

It is an arithmetic number, because the mean of its divisors is an integer number (1868559007).

Almost surely, 2^21010524020 is an apocalyptic number.

21010524020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010524020 is an abundant number, since it is smaller than the sum of its proper divisors (23834892148).

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

21010524020 is a wasteful number, since it uses less digits than its factorization.

21010524020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17221811 (or 17221809 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The spelling of 21010524020 in words is "twenty-one billion, ten million, five hundred twenty-four thousand, twenty".