21203942342029 has 2 divisors, whose sum is σ = 21203942342030. Its totient is φ = 21203942342028.

The previous prime is 21203942342021. The next prime is 21203942342117. The reversal of 21203942342029 is 92024324930212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12692311141129 + 8511631200900 = 3562627^2 + 2917470^2 .

It is a cyclic number.

It is not a de Polignac number, because 21203942342029 - 2³ = 21203942342021 is a prime.

It is a super-3 number, since 3×21203942342029³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203942342021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601971171014 + 10601971171015.

It is an arithmetic number, because the mean of its divisors is an integer number (10601971171015).

Almost surely, 2^{21203942342029} is an apocalyptic number.

It is an amenable number.

21203942342029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203942342029 is an equidigital number, since it uses as much as digits as its factorization.

21203942342029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 21203942342029 in words is "twenty-one trillion, two hundred three billion, nine hundred forty-two million, three hundred forty-two thousand, twenty-nine".