21772103 has 2 divisors, whose sum is σ = 21772104. Its totient is φ = 21772102.

The previous prime is 21772097. The next prime is 21772109. The reversal of 21772103 is 30127712.

It is a balanced prime because it is at equal distance from previous prime (21772097) and next prime (21772109).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21772103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21772109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10886051 + 10886052.

It is an arithmetic number, because the mean of its divisors is an integer number (10886052).

Almost surely, 2^21772103 is an apocalyptic number.

21772103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21772103 is an equidigital number, since it uses as much as digits as its factorization.

21772103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 21772103 is about 4666.0586151483. The cubic root of 21772103 is about 279.2330328688.

Adding to 21772103 its reverse (30127712), we get a palindrome (51899815).

The spelling of 21772103 in words is "twenty-one million, seven hundred seventy-two thousand, one hundred three".