21432125541 has 8 divisors (see below), whose sum is σ = 28585902240. Its totient is φ = 14283216272.

The previous prime is 21432125503. The next prime is 21432125543. The reversal of 21432125541 is 14552123412.

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

It is a cyclic number.

It is not a de Polignac number, because 21432125541 - 2⁷ = 21432125413 is a prime.

It is a super-4 number, since 4×21432125541⁴ (a number of 42 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21432125499 and 21432125508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432125543) 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, 1206570 + ... + 1224203.

It is an arithmetic number, because the mean of its divisors is an integer number (3573237780).

Almost surely, 2^21432125541 is an apocalyptic number.

It is an amenable number.

21432125541 is a deficient number, since it is larger than the sum of its proper divisors (7153776699).

21432125541 is a wasteful number, since it uses less digits than its factorization.

21432125541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433715.

The product of its digits is 9600, while the sum is 30.

Adding to 21432125541 its reverse (14552123412), we get a palindrome (35984248953).

The spelling of 21432125541 in words is "twenty-one billion, four hundred thirty-two million, one hundred twenty-five thousand, five hundred forty-one".