21221542233441 has 320 divisors, whose sum is σ = 36730795622400. Its totient is φ = 12097049328000.

The previous prime is 21221542233421. The next prime is 21221542233511. The reversal of 21221542233441 is 14433224512212.

21221542233441 is a `hidden beast` number, since 2 + 1 + 2 + 21 + 542 + 23 + 34 + 41 = 666.

It is not a de Polignac number, because 21221542233441 - 2³¹ = 21219394749793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221542233396 and 21221542233405.

It is not an unprimeable number, because it can be changed into a prime (21221542233401) by changing a digit.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 26965110450 + ... + 26965111236.

It is an arithmetic number, because the mean of its divisors is an integer number (114783736320).

Almost surely, 2^{21221542233441} is an apocalyptic number.

It is an amenable number.

21221542233441 is a deficient number, since it is larger than the sum of its proper divisors (15509253388959).

21221542233441 is a wasteful number, since it uses less digits than its factorization.

21221542233441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142 (or 1133 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

Adding to 21221542233441 its reverse (14433224512212), we get a palindrome (35654766745653).

The spelling of 21221542233441 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred forty-two million, two hundred thirty-three thousand, four hundred forty-one".