21531808282054 has 16 divisors (see below), whose sum is σ = 36912112869888. Its totient is φ = 9227807452872.

The previous prime is 21531808282001. The next prime is 21531808282067. The reversal of 21531808282054 is 45028280813512.

It is a junction number, because it is equal to n+sod(n) for n = 21531808281989 and 21531808282007.

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, 7980772 + ... + 10332295.

It is an arithmetic number, because the mean of its divisors is an integer number (2307007054368).

Almost surely, 2^{21531808282054} is an apocalyptic number.

21531808282054 is a deficient number, since it is larger than the sum of its proper divisors (15380304587834).

21531808282054 is a wasteful number, since it uses less digits than its factorization.

21531808282054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18397059.

The product of its (nonzero) digits is 1228800, while the sum is 49.

The spelling of 21531808282054 in words is "twenty-one trillion, five hundred thirty-one billion, eight hundred eight million, two hundred eighty-two thousand, fifty-four".