21235118 has 12 divisors (see below), whose sum is σ = 33299448. Its totient is φ = 10155420.

The previous prime is 21235111. The next prime is 21235127. The reversal of 21235118 is 81153212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21235093 and 21235102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21235111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8978 + ... + 11093.

It is an arithmetic number, because the mean of its divisors is an integer number (2774954).

Almost surely, 2^21235118 is an apocalyptic number.

21235118 is a deficient number, since it is larger than the sum of its proper divisors (12064330).

21235118 is a wasteful number, since it uses less digits than its factorization.

21235118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20119 (or 20096 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 21235118 is about 4608.1577663965. The cubic root of 21235118 is about 276.9182379773.

The spelling of 21235118 in words is "twenty-one million, two hundred thirty-five thousand, one hundred eighteen".