21144244340434 has 32 divisors (see below), whose sum is σ = 33762223656000. Its totient is φ = 9902731981824.

The previous prime is 21144244340363. The next prime is 21144244340533. The reversal of 21144244340434 is 43404344244112.

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, 86602722 + ... + 86846530.

It is an arithmetic number, because the mean of its divisors is an integer number (1055069489250).

Almost surely, 2^{21144244340434} is an apocalyptic number.

21144244340434 is a deficient number, since it is larger than the sum of its proper divisors (12617979315566).

21144244340434 is a wasteful number, since it uses less digits than its factorization.

21144244340434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269562.

The product of its (nonzero) digits is 589824, while the sum is 40.

Adding to 21144244340434 its reverse (43404344244112), we get a palindrome (64548588584546).

The spelling of 21144244340434 in words is "twenty-one trillion, one hundred forty-four billion, two hundred forty-four million, three hundred forty thousand, four hundred thirty-four".