21221002027 has 2 divisors, whose sum is σ = 21221002028. Its totient is φ = 21221002026.

The previous prime is 21221002001. The next prime is 21221002069. The reversal of 21221002027 is 72020012212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221002027 - 2⁷ = 21221001899 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221001995 and 21221002013.

It is not a weakly prime, because it can be changed into another prime (21221002087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610501013 + 10610501014.

It is an arithmetic number, because the mean of its divisors is an integer number (10610501014).

Almost surely, 2^21221002027 is an apocalyptic number.

21221002027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221002027 is an equidigital number, since it uses as much as digits as its factorization.

21221002027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

Adding to 21221002027 its reverse (72020012212), we get a palindrome (93241014239).

The spelling of 21221002027 in words is "twenty-one billion, two hundred twenty-one million, two thousand, twenty-seven".