21466378137144 has 64 divisors (see below), whose sum is σ = 54090109497600. Its totient is φ = 7098966850304.

The previous prime is 21466378137137. The next prime is 21466378137163. The reversal of 21466378137144 is 44173187366412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3522877 + ... + 7439315.

It is an arithmetic number, because the mean of its divisors is an integer number (845157960900).

Almost surely, 2^{21466378137144} is an apocalyptic number.

21466378137144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21466378137144 is an abundant number, since it is smaller than the sum of its proper divisors (32623731360456).

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

21466378137144 is a wasteful number, since it uses less digits than its factorization.

21466378137144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3918252 (or 3918248 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 57.

The spelling of 21466378137144 in words is "twenty-one trillion, four hundred sixty-six billion, three hundred seventy-eight million, one hundred thirty-seven thousand, one hundred forty-four".