21202021122 has 8 divisors (see below), whose sum is σ = 42404042256. Its totient is φ = 7067340372.

The previous prime is 21202021117. The next prime is 21202021129. The reversal of 21202021122 is 22112020212.

It is a sphenic number, since it is the product of 3 distinct primes.

21202021122 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21202021129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1766835088 + ... + 1766835099.

It is an arithmetic number, because the mean of its divisors is an integer number (5300505282).

Almost surely, 2^21202021122 is an apocalyptic number.

21202021122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21202021122 is a wasteful number, since it uses less digits than its factorization.

21202021122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3533670192.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21202021122 its reverse (22112020212), we get a palindrome (43314041334).

The spelling of 21202021122 in words is "twenty-one billion, two hundred two million, twenty-one thousand, one hundred twenty-two".