21000101112031 has 2 divisors, whose sum is σ = 21000101112032. Its totient is φ = 21000101112030.

The previous prime is 21000101111989. The next prime is 21000101112037. The reversal of 21000101112031 is 13021110100012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000101112031 - 2³⁹ = 20450345298143 is a prime.

It is a super-2 number, since 2×21000101112031² (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 (21000101112037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500050556015 + 10500050556016.

It is an arithmetic number, because the mean of its divisors is an integer number (10500050556016).

Almost surely, 2^{21000101112031} is an apocalyptic number.

21000101112031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000101112031 is an equidigital number, since it uses as much as digits as its factorization.

21000101112031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21000101112031 its reverse (13021110100012), we get a palindrome (34021211212043).

The spelling of 21000101112031 in words is "twenty-one trillion, one hundred one million, one hundred twelve thousand, thirty-one".