21545144414054 has 4 divisors (see below), whose sum is σ = 32317716621084. Its totient is φ = 10772572207026.

The previous prime is 21545144414047. The next prime is 21545144414063. The reversal of 21545144414054 is 45041444154512.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×21545144414054³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21545144413996 and 21545144414014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5386286103512 + ... + 5386286103515.

It is an arithmetic number, because the mean of its divisors is an integer number (8079429155271).

Almost surely, 2^{21545144414054} is an apocalyptic number.

21545144414054 is a deficient number, since it is larger than the sum of its proper divisors (10772572207030).

21545144414054 is a wasteful number, since it uses less digits than its factorization.

21545144414054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10772572207029.

The product of its (nonzero) digits is 1024000, while the sum is 44.

Adding to 21545144414054 its reverse (45041444154512), we get a palindrome (66586588568566).

The spelling of 21545144414054 in words is "twenty-one trillion, five hundred forty-five billion, one hundred forty-four million, four hundred fourteen thousand, fifty-four".