21133141521 has 16 divisors (see below), whose sum is σ = 28436443200. Its totient is φ = 13959632960.

The previous prime is 21133141517. The next prime is 21133141537. The reversal of 21133141521 is 12514133112.

It is a cyclic number.

It is not a de Polignac number, because 21133141521 - 2² = 21133141517 is a prime.

It is a super-2 number, since 2×21133141521² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21133141491 and 21133141500.

It is not an unprimeable number, because it can be changed into a prime (21133141591) 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, 215455 + ... + 297803.

It is an arithmetic number, because the mean of its divisors is an integer number (1777277700).

Almost surely, 2^21133141521 is an apocalyptic number.

It is an amenable number.

21133141521 is a deficient number, since it is larger than the sum of its proper divisors (7303301679).

21133141521 is a wasteful number, since it uses less digits than its factorization.

21133141521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83136.

The product of its digits is 720, while the sum is 24.

Adding to 21133141521 its reverse (12514133112), we get a palindrome (33647274633).

The spelling of 21133141521 in words is "twenty-one billion, one hundred thirty-three million, one hundred forty-one thousand, five hundred twenty-one".