21145122029 has 2 divisors, whose sum is σ = 21145122030. Its totient is φ = 21145122028.

The previous prime is 21145122017. The next prime is 21145122043. The reversal of 21145122029 is 92022154112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17058972100 + 4086149929 = 130610^2 + 63923^2 .

It is a cyclic number.

It is not a de Polignac number, because 21145122029 - 2¹² = 21145117933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21145121992 and 21145122010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21145128029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572561014 + 10572561015.

It is an arithmetic number, because the mean of its divisors is an integer number (10572561015).

Almost surely, 2^21145122029 is an apocalyptic number.

It is an amenable number.

21145122029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145122029 is an equidigital number, since it uses as much as digits as its factorization.

21145122029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The spelling of 21145122029 in words is "twenty-one billion, one hundred forty-five million, one hundred twenty-two thousand, twenty-nine".