21135014827 has 2 divisors, whose sum is σ = 21135014828. Its totient is φ = 21135014826.

The previous prime is 21135014809. The next prime is 21135014851. The reversal of 21135014827 is 72841053112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21135014827 - 2¹⁵ = 21134982059 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21135014792 and 21135014801.

It is not a weakly prime, because it can be changed into another prime (21135014867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10567507413 + 10567507414.

It is an arithmetic number, because the mean of its divisors is an integer number (10567507414).

Almost surely, 2^21135014827 is an apocalyptic number.

21135014827 is a deficient number, since it is larger than the sum of its proper divisors (1).

21135014827 is an equidigital number, since it uses as much as digits as its factorization.

21135014827 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 34.

Adding to 21135014827 its reverse (72841053112), we get a palindrome (93976067939).

The spelling of 21135014827 in words is "twenty-one billion, one hundred thirty-five million, fourteen thousand, eight hundred twenty-seven".