21240451524141 has 16 divisors (see below), whose sum is σ = 31791741116800. Its totient is φ = 14014318529664.

The previous prime is 21240451524137. The next prime is 21240451524203. The reversal of 21240451524141 is 14142515404212.

It is a happy number.

21240451524141 is a `hidden beast` number, since 2 + 1 + 2 + 40 + 4 + 51 + 524 + 1 + 41 = 666.

It is not a de Polignac number, because 21240451524141 - 2² = 21240451524137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21240451524096 and 21240451524105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240451524841) 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, 4055066401 + ... + 4055071638.

It is an arithmetic number, because the mean of its divisors is an integer number (1986983819800).

Almost surely, 2^{21240451524141} is an apocalyptic number.

It is an amenable number.

21240451524141 is a deficient number, since it is larger than the sum of its proper divisors (10551289592659).

21240451524141 is an equidigital number, since it uses as much as digits as its factorization.

21240451524141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8110138145 (or 8110138139 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 36.

Adding to 21240451524141 its reverse (14142515404212), we get a palindrome (35382966928353).

The spelling of 21240451524141 in words is "twenty-one trillion, two hundred forty billion, four hundred fifty-one million, five hundred twenty-four thousand, one hundred forty-one".