21440522321535 has 16 divisors (see below), whose sum is σ = 35487761084640. Its totient is φ = 11040636781440.

The previous prime is 21440522321531. The next prime is 21440522321587. The reversal of 21440522321535 is 53512322504412.

It is not a de Polignac number, because 21440522321535 - 2² = 21440522321531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21440522321493 and 21440522321502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440522321531) 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, 24644278096 + ... + 24644278965.

It is an arithmetic number, because the mean of its divisors is an integer number (2217985067790).

Almost surely, 2^{21440522321535} is an apocalyptic number.

21440522321535 is a deficient number, since it is larger than the sum of its proper divisors (14047238763105).

21440522321535 is a wasteful number, since it uses less digits than its factorization.

21440522321535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49288557098.

The product of its (nonzero) digits is 288000, while the sum is 39.

Adding to 21440522321535 its reverse (53512322504412), we get a palindrome (74952844825947).

The spelling of 21440522321535 in words is "twenty-one trillion, four hundred forty billion, five hundred twenty-two million, three hundred twenty-one thousand, five hundred thirty-five".