21012002100029 has 2 divisors, whose sum is σ = 21012002100030. Its totient is φ = 21012002100028.

The previous prime is 21012002099917. The next prime is 21012002100041. The reversal of 21012002100029 is 92000120021012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15801237155929 + 5210764944100 = 3975077^2 + 2282710^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012002100029 - 2²⁰ = 21012001051453 is a prime.

It is a super-2 number, since 2×21012002100029² (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 (21012002109029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506001050014 + 10506001050015.

It is an arithmetic number, because the mean of its divisors is an integer number (10506001050015).

Almost surely, 2^{21012002100029} is an apocalyptic number.

It is an amenable number.

21012002100029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012002100029 is an equidigital number, since it uses as much as digits as its factorization.

21012002100029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 21012002100029 in words is "twenty-one trillion, twelve billion, two million, one hundred thousand, twenty-nine".