21053524441 has 4 divisors (see below), whose sum is σ = 21219300352. Its totient is φ = 20887748532.

The previous prime is 21053524439. The next prime is 21053524493. The reversal of 21053524441 is 14442535012.

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 21053524441 - 2¹ = 21053524439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21056524441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82887765 + ... + 82888018.

It is an arithmetic number, because the mean of its divisors is an integer number (5304825088).

Almost surely, 2^21053524441 is an apocalyptic number.

It is an amenable number.

21053524441 is a deficient number, since it is larger than the sum of its proper divisors (165775911).

21053524441 is a wasteful number, since it uses less digits than its factorization.

21053524441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165775910.

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 21053524441 in words is "twenty-one billion, fifty-three million, five hundred twenty-four thousand, four hundred forty-one".