21201122 has 4 divisors (see below), whose sum is σ = 31801686. Its totient is φ = 10600560.

The previous prime is 21201121. The next prime is 21201127. The reversal of 21201122 is 22110212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19616041 + 1585081 = 4429^2 + 1259^2 .

It is not an unprimeable number, because it can be changed into a prime (21201121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300279 + ... + 5300282.

Almost surely, 2^21201122 is an apocalyptic number.

21201122 is a deficient number, since it is larger than the sum of its proper divisors (10600564).

21201122 is a wasteful number, since it uses less digits than its factorization.

21201122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10600563.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21201122 is about 4604.4676130906. The cubic root of 21201122 is about 276.7703832040.

Adding to 21201122 its reverse (22110212), we get a palindrome (43311334).

The spelling of 21201122 in words is "twenty-one million, two hundred one thousand, one hundred twenty-two".