21010012027 has 2 divisors, whose sum is σ = 21010012028. Its totient is φ = 21010012026.

The previous prime is 21010012019. The next prime is 21010012057. The reversal of 21010012027 is 72021001012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21010012027 - 2³ = 21010012019 is a prime.

It is a super-3 number, since 3×21010012027³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21010012027.

It is not a weakly prime, because it can be changed into another prime (21010012057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505006013 + 10505006014.

It is an arithmetic number, because the mean of its divisors is an integer number (10505006014).

Almost surely, 2^21010012027 is an apocalyptic number.

21010012027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010012027 is an equidigital number, since it uses as much as digits as its factorization.

21010012027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 16.

Adding to 21010012027 its reverse (72021001012), we get a palindrome (93031013039).

The spelling of 21010012027 in words is "twenty-one billion, ten million, twelve thousand, twenty-seven".