21113161660444 has 24 divisors (see below), whose sum is σ = 42600007604448. Its totient is φ = 8968422650880.

The previous prime is 21113161660397. The next prime is 21113161660469. The reversal of 21113161660444 is 44406616131112.

It is a junction number, because it is equal to n+sod(n) for n = 21113161660397 and 21113161660406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3336463597 + ... + 3336469924.

It is an arithmetic number, because the mean of its divisors is an integer number (1775000316852).

Almost surely, 2^{21113161660444} is an apocalyptic number.

It is an amenable number.

21113161660444 is an abundant number, since it is smaller than the sum of its proper divisors (21486845944004).

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

21113161660444 is a wasteful number, since it uses less digits than its factorization.

21113161660444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6672933645 (or 6672933643 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

Adding to 21113161660444 its reverse (44406616131112), we get a palindrome (65519777791556).

The spelling of 21113161660444 in words is "twenty-one trillion, one hundred thirteen billion, one hundred sixty-one million, six hundred sixty thousand, four hundred forty-four".