21221523226353 has 8 divisors (see below), whose sum is σ = 28302662579968. Its totient is φ = 14144033011824.

The previous prime is 21221523226261. The next prime is 21221523226381. The reversal of 21221523226353 is 35362232512212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21221523226353 - 2¹⁷ = 21221523095281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21221523226153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 912271201 + ... + 912294462.

It is an arithmetic number, because the mean of its divisors is an integer number (3537832822496).

Almost surely, 2^{21221523226353} is an apocalyptic number.

It is an amenable number.

21221523226353 is a deficient number, since it is larger than the sum of its proper divisors (7081139353615).

21221523226353 is a wasteful number, since it uses less digits than its factorization.

21221523226353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824569543.

The product of its digits is 259200, while the sum is 39.

Adding to 21221523226353 its reverse (35362232512212), we get a palindrome (56583755738565).

The spelling of 21221523226353 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred twenty-three million, two hundred twenty-six thousand, three hundred fifty-three".