10561721016 has 64 divisors (see below), whose sum is σ = 32919655680. Its totient is φ = 2743303680.

The previous prime is 10561720997. The next prime is 10561721063. The reversal of 10561721016 is 61012716501.

It is a super-2 number, since 2×10561721016² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2855761 + ... + 2859456.

It is an arithmetic number, because the mean of its divisors is an integer number (514369620).

Almost surely, 2^10561721016 is an apocalyptic number.

It is an amenable number.

10561721016 is an abundant number, since it is smaller than the sum of its proper divisors (22357934664).

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

10561721016 is a wasteful number, since it uses less digits than its factorization.

10561721016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5715244 (or 5715240 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 30.

The spelling of 10561721016 in words is "ten billion, five hundred sixty-one million, seven hundred twenty-one thousand, sixteen".