21654013441 has 4 divisors (see below), whose sum is σ = 21656823552. Its totient is φ = 21651203332.

The previous prime is 21654013427. The next prime is 21654013489. The reversal of 21654013441 is 14431045612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21654013441 - 2¹⁹ = 21653489153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21654013411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1393465 + ... + 1408918.

It is an arithmetic number, because the mean of its divisors is an integer number (5414205888).

Almost surely, 2^21654013441 is an apocalyptic number.

It is an amenable number.

21654013441 is a deficient number, since it is larger than the sum of its proper divisors (2810111).

21654013441 is an equidigital number, since it uses as much as digits as its factorization.

21654013441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2810110.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 21654013441 in words is "twenty-one billion, six hundred fifty-four million, thirteen thousand, four hundred forty-one".