21221022103 has 2 divisors, whose sum is σ = 21221022104. Its totient is φ = 21221022102.

The previous prime is 21221022101. The next prime is 21221022113. The reversal of 21221022103 is 30122012212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221022103 - 2¹ = 21221022101 is a prime.

Together with 21221022101, 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 (21221022101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610511051 + 10610511052.

It is an arithmetic number, because the mean of its divisors is an integer number (10610511052).

Almost surely, 2^21221022103 is an apocalyptic number.

21221022103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221022103 is an equidigital number, since it uses as much as digits as its factorization.

21221022103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21221022103 its reverse (30122012212), we get a palindrome (51343034315).

The spelling of 21221022103 in words is "twenty-one billion, two hundred twenty-one million, twenty-two thousand, one hundred three".