21440434404490 has 8 divisors (see below), whose sum is σ = 38592781928100. Its totient is φ = 8576173761792.

The previous prime is 21440434404461. The next prime is 21440434404491. The reversal of 21440434404490 is 9440443404412.

It can be written as a sum of positive squares in 2 ways, for example, as 21427650258001 + 12784146489 = 4629001^2 + 113067^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 1072021720215 + ... + 1072021720234.

Almost surely, 2^{21440434404490} is an apocalyptic number.

21440434404490 is a deficient number, since it is larger than the sum of its proper divisors (17152347523610).

21440434404490 is a wasteful number, since it uses less digits than its factorization.

21440434404490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144043440456.

The product of its (nonzero) digits is 884736, while the sum is 43.

The spelling of 21440434404490 in words is "twenty-one trillion, four hundred forty billion, four hundred thirty-four million, four hundred four thousand, four hundred ninety".