21010566610904 has 32 divisors (see below), whose sum is σ = 42425459076000. Its totient is φ = 9697121390592.

The previous prime is 21010566610849. The next prime is 21010566610907. The reversal of 21010566610904 is 40901666501012.

It is a super-2 number, since 2×21010566610904² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010566610907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17871512 + ... + 19010840.

It is an arithmetic number, because the mean of its divisors is an integer number (1325795596125).

Almost surely, 2^{21010566610904} is an apocalyptic number.

It is an amenable number.

21010566610904 is an abundant number, since it is smaller than the sum of its proper divisors (21414892465096).

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

21010566610904 is a wasteful number, since it uses less digits than its factorization.

21010566610904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316667 (or 1316663 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 21010566610904 in words is "twenty-one trillion, ten billion, five hundred sixty-six million, six hundred ten thousand, nine hundred four".