21215035027 has 2 divisors, whose sum is σ = 21215035028. Its totient is φ = 21215035026.

The previous prime is 21215035003. The next prime is 21215035033. The reversal of 21215035027 is 72053051212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21215035027 - 2¹⁹ = 21214510739 is a prime.

It is a super-2 number, since 2×21215035027² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21215034986 and 21215035004.

It is not a weakly prime, because it can be changed into another prime (21215035327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607517513 + 10607517514.

It is an arithmetic number, because the mean of its divisors is an integer number (10607517514).

Almost surely, 2^21215035027 is an apocalyptic number.

21215035027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21215035027 is an equidigital number, since it uses as much as digits as its factorization.

21215035027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 28.

Adding to 21215035027 its reverse (72053051212), we get a palindrome (93268086239).

The spelling of 21215035027 in words is "twenty-one billion, two hundred fifteen million, thirty-five thousand, twenty-seven".