21361122 has 24 divisors (see below), whose sum is σ = 46640880. Its totient is φ = 7065240.

The previous prime is 21361121. The next prime is 21361133. The reversal of 21361122 is 22116312.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21361095 and 21361104.

It is not an unprimeable number, because it can be changed into a prime (21361121) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2172 + ... + 6887.

It is an arithmetic number, because the mean of its divisors is an integer number (1943370).

Almost surely, 2^21361122 is an apocalyptic number.

21361122 is an abundant number, since it is smaller than the sum of its proper divisors (25279758).

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

21361122 is a wasteful number, since it uses less digits than its factorization.

21361122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9198 (or 9195 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 21361122 is about 4621.8093859440. The cubic root of 21361122 is about 277.4648798992.

Adding to 21361122 its reverse (22116312), we get a palindrome (43477434).

The spelling of 21361122 in words is "twenty-one million, three hundred sixty-one thousand, one hundred twenty-two".