21541487554868 has 12 divisors (see below), whose sum is σ = 38499679885632. Its totient is φ = 10541579016120.

The previous prime is 21541487554789. The next prime is 21541487554921. The reversal of 21541487554868 is 86845578414512.

It is a junction number, because it is equal to n+sod(n) for n = 21541487554798 and 21541487554807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57291190118 + ... + 57291190493.

It is an arithmetic number, because the mean of its divisors is an integer number (3208306657136).

Almost surely, 2^{21541487554868} is an apocalyptic number.

It is an amenable number.

21541487554868 is a deficient number, since it is larger than the sum of its proper divisors (16958192330764).

21541487554868 is a wasteful number, since it uses less digits than its factorization.

21541487554868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114582380662 (or 114582380660 counting only the distinct ones).

The product of its digits is 344064000, while the sum is 68.

The spelling of 21541487554868 in words is "twenty-one trillion, five hundred forty-one billion, four hundred eighty-seven million, five hundred fifty-four thousand, eight hundred sixty-eight".