21115665135046 has 16 divisors (see below), whose sum is σ = 32475761882928. Its totient is φ = 10290883235200.

The previous prime is 21115665135041. The next prime is 21115665135079. The reversal of 21115665135046 is 64053156651112.

It is a junction number, because it is equal to n+sod(n) for n = 21115665134987 and 21115665135005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115665135041) 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, 117925255 + ... + 118104178.

It is an arithmetic number, because the mean of its divisors is an integer number (2029735117683).

Almost surely, 2^{21115665135046} is an apocalyptic number.

21115665135046 is a deficient number, since it is larger than the sum of its proper divisors (11360096747882).

21115665135046 is a wasteful number, since it uses less digits than its factorization.

21115665135046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236030567.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 21115665135046 in words is "twenty-one trillion, one hundred fifteen billion, six hundred sixty-five million, one hundred thirty-five thousand, forty-six".