21533541154241 has 16 divisors (see below), whose sum is σ = 21908734240848. Its totient is φ = 21159074534400.

The previous prime is 21533541154199. The next prime is 21533541154243. The reversal of 21533541154241 is 14245114533512.

It can be written as a sum of positive squares in 8 ways, for example, as 6413070019216 + 15120471135025 = 2532404^2 + 3888505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21533541154241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21533541154243) 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, 249496691 + ... + 249582983.

It is an arithmetic number, because the mean of its divisors is an integer number (1369295890053).

Almost surely, 2^{21533541154241} is an apocalyptic number.

It is an amenable number.

21533541154241 is a deficient number, since it is larger than the sum of its proper divisors (375193086607).

21533541154241 is a wasteful number, since it uses less digits than its factorization.

21533541154241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90452.

The product of its digits is 288000, while the sum is 41.

Adding to 21533541154241 its reverse (14245114533512), we get a palindrome (35778655687753).

The spelling of 21533541154241 in words is "twenty-one trillion, five hundred thirty-three billion, five hundred forty-one million, one hundred fifty-four thousand, two hundred forty-one".