21211425231444 has 144 divisors (see below), whose sum is σ = 65669842038528. Its totient is φ = 5640237909504.

The previous prime is 21211425231443. The next prime is 21211425231551. The reversal of 21211425231444 is 44413252411212.

21211425231444 is a `hidden beast` number, since 2 + 1 + 2 + 114 + 2 + 523 + 14 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21211425231399 and 21211425231408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211425231443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49240497 + ... + 49669400.

It is an arithmetic number, because the mean of its divisors is an integer number (456040569712).

Almost surely, 2^{21211425231444} is an apocalyptic number.

It is an amenable number.

21211425231444 is an abundant number, since it is smaller than the sum of its proper divisors (44458416807084).

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

21211425231444 is a wasteful number, since it uses less digits than its factorization.

21211425231444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98909974 (or 98909969 counting only the distinct ones).

The product of its digits is 61440, while the sum is 36.

Adding to 21211425231444 its reverse (44413252411212), we get a palindrome (65624677642656).

The spelling of 21211425231444 in words is "twenty-one trillion, two hundred eleven billion, four hundred twenty-five million, two hundred thirty-one thousand, four hundred forty-four".