21012120201031 has 2 divisors, whose sum is σ = 21012120201032. Its totient is φ = 21012120201030.

The previous prime is 21012120201011. The next prime is 21012120201041. The reversal of 21012120201031 is 13010202121012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012120201031 is a prime.

It is a super-2 number, since 2×21012120201031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21012120200996 and 21012120201014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012120201001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506060100515 + 10506060100516.

It is an arithmetic number, because the mean of its divisors is an integer number (10506060100516).

Almost surely, 2^{21012120201031} is an apocalyptic number.

21012120201031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012120201031 is an equidigital number, since it uses as much as digits as its factorization.

21012120201031 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 16.

Adding to 21012120201031 its reverse (13010202121012), we get a palindrome (34022322322043).

The spelling of 21012120201031 in words is "twenty-one trillion, twelve billion, one hundred twenty million, two hundred one thousand, thirty-one".