21960026 has 16 divisors (see below), whose sum is σ = 36294048. Its totient is φ = 9882000.

The previous prime is 21960023. The next prime is 21960049. The reversal of 21960026 is 62006912.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21959977 and 21960004.

It is not an unprimeable number, because it can be changed into a prime (21960023) 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 in 7 ways as a sum of consecutive naturals, for example, 2720 + ... + 7163.

It is an arithmetic number, because the mean of its divisors is an integer number (2268378).

Almost surely, 2^21960026 is an apocalyptic number.

21960026 is a deficient number, since it is larger than the sum of its proper divisors (14334022).

21960026 is a wasteful number, since it uses less digits than its factorization.

21960026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9997.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21960026 is about 4686.1525796756. The cubic root of 21960026 is about 280.0341199917.

Adding to 21960026 its reverse (62006912), we get a palindrome (83966938).

The spelling of 21960026 in words is "twenty-one million, nine hundred sixty thousand, twenty-six".