21444221431413 has 48 divisors (see below), whose sum is σ = 34322489510400. Its totient is φ = 12792346475040.

The previous prime is 21444221431393. The next prime is 21444221431447. The reversal of 21444221431413 is 31413412244412.

21444221431413 is a `hidden beast` number, since 2 + 14 + 4 + 4 + 221 + 4 + 3 + 1 + 413 = 666.

It is not a de Polignac number, because 21444221431413 - 2⁴⁰ = 20344709803637 is a prime.

It is a super-2 number, since 2×21444221431413² (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 (21444221431013) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7067008 + ... + 9634886.

It is an arithmetic number, because the mean of its divisors is an integer number (715051864800).

Almost surely, 2^{21444221431413} is an apocalyptic number.

It is an amenable number.

21444221431413 is a deficient number, since it is larger than the sum of its proper divisors (12878268078987).

21444221431413 is a wasteful number, since it uses less digits than its factorization.

21444221431413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569222 (or 2569219 counting only the distinct ones).

The product of its digits is 73728, while the sum is 36.

Adding to 21444221431413 its reverse (31413412244412), we get a palindrome (52857633675825).

The spelling of 21444221431413 in words is "twenty-one trillion, four hundred forty-four billion, two hundred twenty-one million, four hundred thirty-one thousand, four hundred thirteen".