21350034 has 32 divisors (see below), whose sum is σ = 49944000. Its totient is φ = 6741792.

The previous prime is 21350029. The next prime is 21350039. The reversal of 21350034 is 43005312.

It is an interprime number because it is at equal distance from previous prime (21350029) and next prime (21350039).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21349989 and 21350016.

It is not an unprimeable number, because it can be changed into a prime (21350039) 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 15 ways as a sum of consecutive naturals, for example, 9379 + ... + 11430.

It is an arithmetic number, because the mean of its divisors is an integer number (1560750).

Almost surely, 2^21350034 is an apocalyptic number.

21350034 is an abundant number, since it is smaller than the sum of its proper divisors (28593966).

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

21350034 is a wasteful number, since it uses less digits than its factorization.

21350034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20839 (or 20833 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21350034 is about 4620.6097000288. The cubic root of 21350034 is about 277.4168633350.

Adding to 21350034 its reverse (43005312), we get a palindrome (64355346).

The spelling of 21350034 in words is "twenty-one million, three hundred fifty thousand, thirty-four".