21102012202031 has 2 divisors, whose sum is σ = 21102012202032. Its totient is φ = 21102012202030.

The previous prime is 21102012202027. The next prime is 21102012202121. The reversal of 21102012202031 is 13020221020112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21102012202031 - 2² = 21102012202027 is a prime.

It is a super-2 number, since 2×21102012202031² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102012205031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551006101015 + 10551006101016.

It is an arithmetic number, because the mean of its divisors is an integer number (10551006101016).

Almost surely, 2^{21102012202031} is an apocalyptic number.

21102012202031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102012202031 is an equidigital number, since it uses as much as digits as its factorization.

21102012202031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21102012202031 its reverse (13020221020112), we get a palindrome (34122233222143).

The spelling of 21102012202031 in words is "twenty-one trillion, one hundred two billion, twelve million, two hundred two thousand, thirty-one".