21232121202 has 24 divisors (see below), whose sum is σ = 48708984636. Its totient is φ = 6661057536.

The previous prime is 21232121201. The next prime is 21232121213. The reversal of 21232121202 is 20212123212.

It can be written as a sum of positive squares in 2 ways, for example, as 21115286721 + 116834481 = 145311^2 + 10809^2 .

It is a super-6 number, since 6×21232121202⁶ (a number of 63 digits) contains 666666 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (21232121201) 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 11 ways as a sum of consecutive naturals, for example, 34692703 + ... + 34693314.

Almost surely, 2^21232121202 is an apocalyptic number.

21232121202 is an abundant number, since it is smaller than the sum of its proper divisors (27476863434).

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

21232121202 is a wasteful number, since it uses less digits than its factorization.

21232121202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69386042 (or 69386039 counting only the distinct ones).

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

Adding to 21232121202 its reverse (20212123212), we get a palindrome (41444244414).

The spelling of 21232121202 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-one thousand, two hundred two".