13533221402421 has 16 divisors (see below), whose sum is σ = 20638722720384. Its totient is φ = 7727017725504.

The previous prime is 13533221402399. The next prime is 13533221402563. The reversal of 13533221402421 is 12420412233531.

It is a happy number.

It is not a de Polignac number, because 13533221402421 - 2¹³ = 13533221394229 is a prime.

It is a super-2 number, since 2×13533221402421² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13533220402421) 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, 260458710 + ... + 260510663.

It is an arithmetic number, because the mean of its divisors is an integer number (1289920170024).

Almost surely, 2^{13533221402421} is an apocalyptic number.

It is an amenable number.

13533221402421 is a deficient number, since it is larger than the sum of its proper divisors (7105501317963).

13533221402421 is a wasteful number, since it uses less digits than its factorization.

13533221402421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520970620.

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 13533221402421 its reverse (12420412233531), we get a palindrome (25953633635952).

The spelling of 13533221402421 in words is "thirteen trillion, five hundred thirty-three billion, two hundred twenty-one million, four hundred two thousand, four hundred twenty-one".