21026934 has 24 divisors (see below), whose sum is σ = 46202832. Its totient is φ = 6909840.

The previous prime is 21026933. The next prime is 21026953. The reversal of 21026934 is 43962012.

It is a junction number, because it is equal to n+sod(n) for n = 21026898 and 21026907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21026933) 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 in 11 ways as a sum of consecutive naturals, for example, 6949 + ... + 9504.

It is an arithmetic number, because the mean of its divisors is an integer number (1925118).

Almost surely, 2^21026934 is an apocalyptic number.

21026934 is an abundant number, since it is smaller than the sum of its proper divisors (25175898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21026934 is a wasteful number, since it uses less digits than its factorization.

21026934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16532 (or 16529 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 21026934 is about 4585.5134936013. The cubic root of 21026934 is about 276.0103178247.

Adding to 21026934 its reverse (43962012), we get a palindrome (64988946).

The spelling of 21026934 in words is "twenty-one million, twenty-six thousand, nine hundred thirty-four".