21261475581710 has 64 divisors (see below), whose sum is σ = 47103846451200. Its totient is φ = 6728692194432.

The previous prime is 21261475581707. The next prime is 21261475581721. The reversal of 21261475581710 is 1718557416212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29527751 + ... + 30239229.

It is an arithmetic number, because the mean of its divisors is an integer number (735997600800).

Almost surely, 2^{21261475581710} is an apocalyptic number.

21261475581710 is an abundant number, since it is smaller than the sum of its proper divisors (25842370869490).

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

21261475581710 is a wasteful number, since it uses less digits than its factorization.

21261475581710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744345.

The product of its (nonzero) digits is 940800, while the sum is 50.

The spelling of 21261475581710 in words is "twenty-one trillion, two hundred sixty-one billion, four hundred seventy-five million, five hundred eighty-one thousand, seven hundred ten".