21010560060 has 144 divisors (see below), whose sum is σ = 69099803136. Its totient is φ = 4755719808.

The previous prime is 21010560037. The next prime is 21010560091. The reversal of 21010560060 is 6006501012.

It is a happy number.

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

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 47 ways as a sum of consecutive naturals, for example, 268129 + ... + 337511.

It is an arithmetic number, because the mean of its divisors is an integer number (479859744).

Almost surely, 2^21010560060 is an apocalyptic number.

21010560060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21010560060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34549901568).

21010560060 is an abundant number, since it is smaller than the sum of its proper divisors (48089243076).

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

21010560060 is a wasteful number, since it uses less digits than its factorization.

21010560060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69512 (or 69503 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The spelling of 21010560060 in words is "twenty-one billion, ten million, five hundred sixty thousand, sixty".