21671122 has 32 divisors (see below), whose sum is σ = 36990720. Its totient is φ = 9434880.

The previous prime is 21671101. The next prime is 21671123. The reversal of 21671122 is 22117612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21671093 and 21671102.

It is not an unprimeable number, because it can be changed into a prime (21671123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64138 + ... + 64474.

It is an arithmetic number, because the mean of its divisors is an integer number (1155960).

Almost surely, 2^21671122 is an apocalyptic number.

21671122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21671122 is a deficient number, since it is larger than the sum of its proper divisors (15319598).

21671122 is a wasteful number, since it uses less digits than its factorization.

21671122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466.

The product of its digits is 336, while the sum is 22.

The square root of 21671122 is about 4655.2252362265. The cubic root of 21671122 is about 278.8006609578.

Adding to 21671122 its reverse (22117612), we get a palindrome (43788734).

The spelling of 21671122 in words is "twenty-one million, six hundred seventy-one thousand, one hundred twenty-two".