21442635201 has 16 divisors (see below), whose sum is σ = 32128096896. Its totient is φ = 12621751296.

The previous prime is 21442635199. The next prime is 21442635281. The reversal of 21442635201 is 10253624412.

It is not a de Polignac number, because 21442635201 - 2¹ = 21442635199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21442635281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11951520 + ... + 11953313.

It is an arithmetic number, because the mean of its divisors is an integer number (2008006056).

Almost surely, 2^21442635201 is an apocalyptic number.

It is an amenable number.

21442635201 is a deficient number, since it is larger than the sum of its proper divisors (10685461695).

21442635201 is a wasteful number, since it uses less digits than its factorization.

21442635201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23904872.

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 21442635201 in words is "twenty-one billion, four hundred forty-two million, six hundred thirty-five thousand, two hundred one".