21341123553 has 32 divisors (see below), whose sum is σ = 30610379520. Its totient is φ = 13178009600.

The previous prime is 21341123537. The next prime is 21341123563. The reversal of 21341123553 is 35532114312.

It is a cyclic number.

It is not a de Polignac number, because 21341123553 - 2⁴ = 21341123537 is a prime.

It is a super-2 number, since 2×21341123553² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21341123553.

It is not an unprimeable number, because it can be changed into a prime (21341123563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 847813 + ... + 872621.

It is an arithmetic number, because the mean of its divisors is an integer number (956574360).

Almost surely, 2^21341123553 is an apocalyptic number.

It is an amenable number.

21341123553 is a deficient number, since it is larger than the sum of its proper divisors (9269255967).

21341123553 is a wasteful number, since it uses less digits than its factorization.

21341123553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25097.

The product of its digits is 10800, while the sum is 30.

Adding to 21341123553 its reverse (35532114312), we get a palindrome (56873237865).

The spelling of 21341123553 in words is "twenty-one billion, three hundred forty-one million, one hundred twenty-three thousand, five hundred fifty-three".