21202302031 has 2 divisors, whose sum is σ = 21202302032. Its totient is φ = 21202302030.

The previous prime is 21202301999. The next prime is 21202302101. The reversal of 21202302031 is 13020320212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21202302031 - 2⁵ = 21202301999 is a prime.

It is a super-2 number, since 2×21202302031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21202301996 and 21202302014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202309031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601151015 + 10601151016.

It is an arithmetic number, because the mean of its divisors is an integer number (10601151016).

Almost surely, 2^21202302031 is an apocalyptic number.

21202302031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202302031 is an equidigital number, since it uses as much as digits as its factorization.

21202302031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21202302031 its reverse (13020320212), we get a palindrome (34222622243).

The spelling of 21202302031 in words is "twenty-one billion, two hundred two million, three hundred two thousand, thirty-one".