212100001939951 has 2 divisors, whose sum is σ = 212100001939952. Its totient is φ = 212100001939950.

The previous prime is 212100001939949. The next prime is 212100001939997. The reversal of 212100001939951 is 159939100001212.

212100001939951 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212100001939951 - 2¹ = 212100001939949 is a prime.

Together with 212100001939949, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 212100001939898 and 212100001939907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212100001939901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106050000969975 + 106050000969976.

It is an arithmetic number, because the mean of its divisors is an integer number (106050000969976).

Almost surely, 2^{212100001939951} is an apocalyptic number.

212100001939951 is a deficient number, since it is larger than the sum of its proper divisors (1).

212100001939951 is an equidigital number, since it uses as much as digits as its factorization.

212100001939951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 43.

The spelling of 212100001939951 in words is "two hundred twelve trillion, one hundred billion, one million, nine hundred thirty-nine thousand, nine hundred fifty-one".