21002020002031 has 2 divisors, whose sum is σ = 21002020002032. Its totient is φ = 21002020002030.

The previous prime is 21002020002017. The next prime is 21002020002101. The reversal of 21002020002031 is 13020002020012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21002020002031 - 2⁷ = 21002020001903 is a prime.

It is a super-2 number, since 2×21002020002031² (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 (21002020002011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501010001015 + 10501010001016.

It is an arithmetic number, because the mean of its divisors is an integer number (10501010001016).

Almost surely, 2^{21002020002031} is an apocalyptic number.

21002020002031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002020002031 is an equidigital number, since it uses as much as digits as its factorization.

21002020002031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21002020002031 its reverse (13020002020012), we get a palindrome (34022022022043).

The spelling of 21002020002031 in words is "twenty-one trillion, two billion, twenty million, two thousand, thirty-one".