21400527853 has 2 divisors, whose sum is σ = 21400527854. Its totient is φ = 21400527852.

The previous prime is 21400527851. The next prime is 21400527857. The reversal of 21400527853 is 35872500412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12315006729 + 9085521124 = 110973^2 + 95318^2 .

It is a cyclic number.

It is not a de Polignac number, because 21400527853 - 2¹ = 21400527851 is a prime.

Together with 21400527851, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21400527851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700263926 + 10700263927.

It is an arithmetic number, because the mean of its divisors is an integer number (10700263927).

Almost surely, 2^21400527853 is an apocalyptic number.

It is an amenable number.

21400527853 is a deficient number, since it is larger than the sum of its proper divisors (1).

21400527853 is an equidigital number, since it uses as much as digits as its factorization.

21400527853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 21400527853 in words is "twenty-one billion, four hundred million, five hundred twenty-seven thousand, eight hundred fifty-three".