21545501405054 has 16 divisors (see below), whose sum is σ = 35357295884400. Its totient is φ = 9765348380160.

The previous prime is 21545501405039. The next prime is 21545501405083. The reversal of 21545501405054 is 45050410554512.

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, 1403059619 + ... + 1403074974.

It is an arithmetic number, because the mean of its divisors is an integer number (2209830992775).

Almost surely, 2^{21545501405054} is an apocalyptic number.

21545501405054 is a deficient number, since it is larger than the sum of its proper divisors (13811794479346).

21545501405054 is a wasteful number, since it uses less digits than its factorization.

21545501405054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806134955.

The product of its (nonzero) digits is 400000, while the sum is 41.

Adding to 21545501405054 its reverse (45050410554512), we get a palindrome (66595911959566).

The spelling of 21545501405054 in words is "twenty-one trillion, five hundred forty-five billion, five hundred one million, four hundred five thousand, fifty-four".