21456010533 has 16 divisors (see below), whose sum is σ = 28962682560. Its totient is φ = 14126792064.

The previous prime is 21456010481. The next prime is 21456010577. The reversal of 21456010533 is 33501065412.

It is not a de Polignac number, because 21456010533 - 2¹⁸ = 21455748389 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21456010533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21456010133) 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, 796753 + ... + 823241.

It is an arithmetic number, because the mean of its divisors is an integer number (1810167660).

Almost surely, 2^21456010533 is an apocalyptic number.

It is an amenable number.

21456010533 is a deficient number, since it is larger than the sum of its proper divisors (7506672027).

21456010533 is a wasteful number, since it uses less digits than its factorization.

21456010533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29828.

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 21456010533 its reverse (33501065412), we get a palindrome (54957075945).

The spelling of 21456010533 in words is "twenty-one billion, four hundred fifty-six million, ten thousand, five hundred thirty-three".