21033124131 has 8 divisors (see below), whose sum is σ = 28045583104. Its totient is φ = 14021373960.

The previous prime is 21033124087. The next prime is 21033124139. The reversal of 21033124131 is 13142133012.

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

It is not a de Polignac number, because 21033124131 - 2⁶ = 21033124067 is a prime.

It is a super-2 number, since 2×21033124131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21033124098 and 21033124107.

It is not an unprimeable number, because it can be changed into a prime (21033124139) 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, 103591 + ... + 229776.

It is an arithmetic number, because the mean of its divisors is an integer number (3505697888).

Almost surely, 2^21033124131 is an apocalyptic number.

21033124131 is a deficient number, since it is larger than the sum of its proper divisors (7012458973).

21033124131 is a wasteful number, since it uses less digits than its factorization.

21033124131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354401.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21033124131 its reverse (13142133012), we get a palindrome (34175257143).

The spelling of 21033124131 in words is "twenty-one billion, thirty-three million, one hundred twenty-four thousand, one hundred thirty-one".