21012100122007 has 2 divisors, whose sum is σ = 21012100122008. Its totient is φ = 21012100122006.

The previous prime is 21012100121827. The next prime is 21012100122017. The reversal of 21012100122007 is 70022100121012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012100122007 - 2¹⁹ = 21012099597719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012100122017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506050061003 + 10506050061004.

It is an arithmetic number, because the mean of its divisors is an integer number (10506050061004).

Almost surely, 2^{21012100122007} is an apocalyptic number.

21012100122007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012100122007 is an equidigital number, since it uses as much as digits as its factorization.

21012100122007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 21012100122007 its reverse (70022100121012), we get a palindrome (91034200243019).

The spelling of 21012100122007 in words is "twenty-one trillion, twelve billion, one hundred million, one hundred twenty-two thousand, seven".