21062101 has 2 divisors, whose sum is σ = 21062102. Its totient is φ = 21062100.

The previous prime is 21062087. The next prime is 21062137. The reversal of 21062101 is 10126012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20921476 + 140625 = 4574^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 21062101 - 2⁷ = 21061973 is a prime.

It is a super-2 number, since 2×21062101² = 887224197068402, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21062401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10531050 + 10531051.

It is an arithmetic number, because the mean of its divisors is an integer number (10531051).

Almost surely, 2^21062101 is an apocalyptic number.

It is an amenable number.

21062101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21062101 is an equidigital number, since it uses as much as digits as its factorization.

21062101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21062101 is about 4589.3464676357. The cubic root of 21062101 is about 276.1641054796.

Adding to 21062101 its reverse (10126012), we get a palindrome (31188113).

The spelling of 21062101 in words is "twenty-one million, sixty-two thousand, one hundred one".