21015472576 has 112 divisors (see below), whose sum is σ = 50233478400. Its totient is φ = 8521555968.

The previous prime is 21015472567. The next prime is 21015472579. The reversal of 21015472576 is 67527451012.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21015472579) 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, 11124240 + ... + 11126128.

It is an arithmetic number, because the mean of its divisors is an integer number (448513200).

Almost surely, 2^21015472576 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21015472576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25116739200).

21015472576 is an abundant number, since it is smaller than the sum of its proper divisors (29218005824).

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

21015472576 is a wasteful number, since it uses less digits than its factorization.

21015472576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3234 (or 3224 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 21015472576 in words is "twenty-one billion, fifteen million, four hundred seventy-two thousand, five hundred seventy-six".