21434440231244 has 6 divisors (see below), whose sum is σ = 37510270404684. Its totient is φ = 10717220115620.

The previous prime is 21434440231189. The next prime is 21434440231247. The reversal of 21434440231244 is 44213204443412.

It is a junction number, because it is equal to n+sod(n) for n = 21434440231198 and 21434440231207.

It is not an unprimeable number, because it can be changed into a prime (21434440231247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2679305028902 + ... + 2679305028909.

It is an arithmetic number, because the mean of its divisors is an integer number (6251711734114).

Almost surely, 2^{21434440231244} is an apocalyptic number.

It is an amenable number.

21434440231244 is a deficient number, since it is larger than the sum of its proper divisors (16075830173440).

21434440231244 is a wasteful number, since it uses less digits than its factorization.

21434440231244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5358610057815 (or 5358610057813 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 38.

Adding to 21434440231244 its reverse (44213204443412), we get a palindrome (65647644674656).

The spelling of 21434440231244 in words is "twenty-one trillion, four hundred thirty-four billion, four hundred forty million, two hundred thirty-one thousand, two hundred forty-four".