21101234 has 32 divisors (see below), whose sum is σ = 40023936. Its totient is φ = 8104320.

The previous prime is 21101219. The next prime is 21101243. The reversal of 21101234 is 43210112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10304 + ... + 12180.

It is an arithmetic number, because the mean of its divisors is an integer number (1250748).

Almost surely, 2^21101234 is an apocalyptic number.

21101234 is a deficient number, since it is larger than the sum of its proper divisors (18922702).

21101234 is a wasteful number, since it uses less digits than its factorization.

21101234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1970.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21101234 is about 4593.6079501847. The cubic root of 21101234 is about 276.3350356207.

Adding to 21101234 its reverse (43210112), we get a palindrome (64311346).

The spelling of 21101234 in words is "twenty-one million, one hundred one thousand, two hundred thirty-four".