21613005742441 has 3 divisors (see below), whose sum is σ = 21613010391421. Its totient is φ = 21613001093462.

The previous prime is 21613005742421. The next prime is 21613005742451. The reversal of 21613005742441 is 14424750031612.

The square root of 21613005742441 is 4648979.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 21613005742441 - 2⁵ = 21613005742409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21613005742394 and 21613005742403.

It is not an unprimeable number, because it can be changed into a prime (21613005742421) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2324490 + ... + 6973468.

Almost surely, 2^{21613005742441} is an apocalyptic number.

21613005742441 is the 4648979-th square number.

21613005742441 is the 2324490-th centered octagonal number.

It is an amenable number.

21613005742441 is a deficient number, since it is larger than the sum of its proper divisors (4648980).

21613005742441 is an frugal number, since it uses more digits than its factorization.

21613005742441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9297958 (or 4648979 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 21613005742441 in words is "twenty-one trillion, six hundred thirteen billion, five million, seven hundred forty-two thousand, four hundred forty-one".