21232101031 has 2 divisors, whose sum is σ = 21232101032. Its totient is φ = 21232101030.

The previous prime is 21232100999. The next prime is 21232101049. The reversal of 21232101031 is 13010123212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21232101031 - 2⁵ = 21232100999 is a prime.

It is a super-2 number, since 2×21232101031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21232100996 and 21232101014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21232101071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616050515 + 10616050516.

It is an arithmetic number, because the mean of its divisors is an integer number (10616050516).

Almost surely, 2^21232101031 is an apocalyptic number.

21232101031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232101031 is an equidigital number, since it uses as much as digits as its factorization.

21232101031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21232101031 its reverse (13010123212), we get a palindrome (34242224243).

The spelling of 21232101031 in words is "twenty-one billion, two hundred thirty-two million, one hundred one thousand, thirty-one".