21202212021031 has 4 divisors (see below), whose sum is σ = 21202221860064. Its totient is φ = 21202202182000.

The previous prime is 21202212021019. The next prime is 21202212021037. The reversal of 21202212021031 is 13012021220212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21202212021031 - 2²⁹ = 21201675150119 is a prime.

It is a super-3 number, since 3×21202212021031³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202212021037) 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, 138070 + ... + 6513331.

It is an arithmetic number, because the mean of its divisors is an integer number (5300555465016).

Almost surely, 2^{21202212021031} is an apocalyptic number.

21202212021031 is a deficient number, since it is larger than the sum of its proper divisors (9839033).

21202212021031 is an equidigital number, since it uses as much as digits as its factorization.

21202212021031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9839032.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21202212021031 its reverse (13012021220212), we get a palindrome (34214233241243).

The spelling of 21202212021031 in words is "twenty-one trillion, two hundred two billion, two hundred twelve million, twenty-one thousand, thirty-one".