21021002010031 has 2 divisors, whose sum is σ = 21021002010032. Its totient is φ = 21021002010030.

The previous prime is 21021002009993. The next prime is 21021002010089. The reversal of 21021002010031 is 13001020012012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021002010031 is a prime.

It is a super-2 number, since 2×21021002010031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21021002009993 and 21021002010020.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021002070031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510501005015 + 10510501005016.

It is an arithmetic number, because the mean of its divisors is an integer number (10510501005016).

Almost surely, 2^{21021002010031} is an apocalyptic number.

21021002010031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021002010031 is an equidigital number, since it uses as much as digits as its factorization.

21021002010031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21021002010031 its reverse (13001020012012), we get a palindrome (34022022022043).

The spelling of 21021002010031 in words is "twenty-one trillion, twenty-one billion, two million, ten thousand, thirty-one".