21200230031 has 2 divisors, whose sum is σ = 21200230032. Its totient is φ = 21200230030.

The previous prime is 21200230003. The next prime is 21200230063. The reversal of 21200230031 is 13003200212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21200230031 - 2³⁴ = 4020360847 is a prime.

It is a super-2 number, since 2×21200230031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21200229988 and 21200230015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21200230091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600115015 + 10600115016.

It is an arithmetic number, because the mean of its divisors is an integer number (10600115016).

Almost surely, 2^21200230031 is an apocalyptic number.

21200230031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200230031 is an equidigital number, since it uses as much as digits as its factorization.

21200230031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21200230031 its reverse (13003200212), we get a palindrome (34203430243).

The spelling of 21200230031 in words is "twenty-one billion, two hundred million, two hundred thirty thousand, thirty-one".