21440434404492 has 18 divisors (see below), whose sum is σ = 54196653633668. Its totient is φ = 7146811468152.

The previous prime is 21440434404491. The next prime is 21440434404511. The reversal of 21440434404492 is 29440443404412.

21440434404492 is a `hidden beast` number, since 2 + 1 + 4 + 40 + 43 + 440 + 44 + 92 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (21440434404491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 297783811138 + ... + 297783811209.

Almost surely, 2^{21440434404492} is an apocalyptic number.

It is an amenable number.

21440434404492 is an abundant number, since it is smaller than the sum of its proper divisors (32756219229176).

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

21440434404492 is a wasteful number, since it uses less digits than its factorization.

21440434404492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595567622357 (or 595567622352 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 45.

The spelling of 21440434404492 in words is "twenty-one trillion, four hundred forty billion, four hundred thirty-four million, four hundred four thousand, four hundred ninety-two".