21101868052 has 96 divisors (see below), whose sum is σ = 41868223488. Its totient is φ = 9251979264.

The previous prime is 21101868023. The next prime is 21101868089. The reversal of 21101868052 is 25086810112.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 21101867999 and 21101868017.

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, 18890998 + ... + 18892114.

It is an arithmetic number, because the mean of its divisors is an integer number (436127328).

Almost surely, 2^21101868052 is an apocalyptic number.

It is an amenable number.

21101868052 is a deficient number, since it is larger than the sum of its proper divisors (20766355436).

21101868052 is a wasteful number, since it uses less digits than its factorization.

21101868052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465 (or 1463 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 34.

The spelling of 21101868052 in words is "twenty-one billion, one hundred one million, eight hundred sixty-eight thousand, fifty-two".