21221132202 has 12 divisors (see below), whose sum is σ = 45979119810. Its totient is φ = 7073710728.

The previous prime is 21221132201. The next prime is 21221132311. The reversal of 21221132202 is 20223112212.

It can be written as a sum of positive squares in only one way, i.e., 21094367121 + 126765081 = 145239^2 + 11259^2 .

It is a super-2 number, since 2×21221132202² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1178951789 = 21221132202 / (2 + 1 + 2 + 2 + 1 + 1 + 3 + 2 + 2 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (21221132201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 589475877 + ... + 589475912.

Almost surely, 2^21221132202 is an apocalyptic number.

21221132202 is an abundant number, since it is smaller than the sum of its proper divisors (24757987608).

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

21221132202 is a wasteful number, since it uses less digits than its factorization.

21221132202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178951797 (or 1178951794 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21221132202 its reverse (20223112212), we get a palindrome (41444244414).

The spelling of 21221132202 in words is "twenty-one billion, two hundred twenty-one million, one hundred thirty-two thousand, two hundred two".