21444024252231 has 40 divisors (see below), whose sum is σ = 36618185286144. Its totient is φ = 12250956255120.

The previous prime is 21444024252179. The next prime is 21444024252241. The reversal of 21444024252231 is 13225242044412.

21444024252231 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 4 + 0 + 2 + 425 + 223 + 1 = 666.

It is not a de Polignac number, because 21444024252231 - 2²² = 21444020057927 is a prime.

It is a super-2 number, since 2×21444024252231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444024252241) 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 39 ways as a sum of consecutive naturals, for example, 1767555 + ... + 6783236.

Almost surely, 2^{21444024252231} is an apocalyptic number.

21444024252231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21444024252231 is a deficient number, since it is larger than the sum of its proper divisors (15174161033913).

21444024252231 is an equidigital number, since it uses as much as digits as its factorization.

21444024252231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8555233 (or 8555224 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 36.

Adding to 21444024252231 its reverse (13225242044412), we get a palindrome (34669266296643).

The spelling of 21444024252231 in words is "twenty-one trillion, four hundred forty-four billion, twenty-four million, two hundred fifty-two thousand, two hundred thirty-one".