21202212031 has 32 divisors (see below), whose sum is σ = 30141877248. Its totient is φ = 14353251840.

The previous prime is 21202212029. The next prime is 21202212041. The reversal of 21202212031 is 13021220212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21202212031 - 2¹ = 21202212029 is a prime.

It is a super-3 number, since 3×21202212031³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21202211996 and 21202212014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202212001) 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 31 ways as a sum of consecutive naturals, for example, 605955 + ... + 639988.

It is an arithmetic number, because the mean of its divisors is an integer number (941933664).

Almost surely, 2^21202212031 is an apocalyptic number.

21202212031 is a deficient number, since it is larger than the sum of its proper divisors (8939665217).

21202212031 is a wasteful number, since it uses less digits than its factorization.

21202212031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245991.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21202212031 its reverse (13021220212), we get a palindrome (34223432243).

The spelling of 21202212031 in words is "twenty-one billion, two hundred two million, two hundred twelve thousand, thirty-one".