21454444034406 has 48 divisors (see below), whose sum is σ = 47187868309920. Its totient is φ = 7043566999680.

The previous prime is 21454444034381. The next prime is 21454444034459. The reversal of 21454444034406 is 60443044445412.

21454444034406 is a `hidden beast` number, since 21 + 4 + 544 + 4 + 40 + 3 + 4 + 40 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10582890 + ... + 12446141.

It is an arithmetic number, because the mean of its divisors is an integer number (983080589790).

Almost surely, 2^{21454444034406} is an apocalyptic number.

21454444034406 is an abundant number, since it is smaller than the sum of its proper divisors (25733424275514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21454444034406 is a wasteful number, since it uses less digits than its factorization.

21454444034406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23029821 (or 23029818 counting only the distinct ones).

The product of its (nonzero) digits is 2949120, while the sum is 45.

Adding to 21454444034406 its reverse (60443044445412), we get a palindrome (81897488479818).

The spelling of 21454444034406 in words is "twenty-one trillion, four hundred fifty-four billion, four hundred forty-four million, thirty-four thousand, four hundred six".