21454203441 has 16 divisors (see below), whose sum is σ = 31223098368. Its totient is φ = 12995470800.

The previous prime is 21454203437. The next prime is 21454203461. The reversal of 21454203441 is 14430245412.

It is not a de Polignac number, because 21454203441 - 2² = 21454203437 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21454203399 and 21454203408.

It is not an unprimeable number, because it can be changed into a prime (21454203461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115045 + ... + 236946.

It is an arithmetic number, because the mean of its divisors is an integer number (1951443648).

Almost surely, 2^21454203441 is an apocalyptic number.

It is an amenable number.

21454203441 is a deficient number, since it is larger than the sum of its proper divisors (9768894927).

21454203441 is a wasteful number, since it uses less digits than its factorization.

21454203441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353852.

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 21454203441 its reverse (14430245412), we get a palindrome (35884448853).

The spelling of 21454203441 in words is "twenty-one billion, four hundred fifty-four million, two hundred three thousand, four hundred forty-one".