21502024525381 has 2 divisors, whose sum is σ = 21502024525382. Its totient is φ = 21502024525380.

The previous prime is 21502024525321. The next prime is 21502024525451. The reversal of 21502024525381 is 18352542020512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11717853228225 + 9784171297156 = 3423135^2 + 3127966^2 .

It is a cyclic number.

It is not a de Polignac number, because 21502024525381 - 2¹¹ = 21502024523333 is a prime.

It is a super-2 number, since 2×21502024525381² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21502024525321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10751012262690 + 10751012262691.

It is an arithmetic number, because the mean of its divisors is an integer number (10751012262691).

Almost surely, 2^{21502024525381} is an apocalyptic number.

It is an amenable number.

21502024525381 is a deficient number, since it is larger than the sum of its proper divisors (1).

21502024525381 is an equidigital number, since it uses as much as digits as its factorization.

21502024525381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192000, while the sum is 40.

Adding to 21502024525381 its reverse (18352542020512), we get a palindrome (39854566545893).

The spelling of 21502024525381 in words is "twenty-one trillion, five hundred two billion, twenty-four million, five hundred twenty-five thousand, three hundred eighty-one".