21060623 has 2 divisors, whose sum is σ = 21060624. Its totient is φ = 21060622.

The previous prime is 21060619. The next prime is 21060629. The reversal of 21060623 is 32606012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21060623 - 2² = 21060619 is a prime.

It is a super-2 number, since 2×21060623² = 887099682296258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21060595 and 21060604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21060629) 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, 10530311 + 10530312.

It is an arithmetic number, because the mean of its divisors is an integer number (10530312).

Almost surely, 2^21060623 is an apocalyptic number.

21060623 is a deficient number, since it is larger than the sum of its proper divisors (1).

21060623 is an equidigital number, since it uses as much as digits as its factorization.

21060623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21060623 is about 4589.1854397050. The cubic root of 21060623 is about 276.1576455337.

Adding to 21060623 its reverse (32606012), we get a palindrome (53666635).

The spelling of 21060623 in words is "twenty-one million, sixty thousand, six hundred twenty-three".