21020000021029 has 2 divisors, whose sum is σ = 21020000021030. Its totient is φ = 21020000021028.

The previous prime is 21020000020997. The next prime is 21020000021051. The reversal of 21020000021029 is 92012000002012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10953352872225 + 10066647148804 = 3309585^2 + 3172798^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020000021029 - 2⁵ = 21020000020997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21020000020997 and 21020000021015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020000021929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510000010514 + 10510000010515.

It is an arithmetic number, because the mean of its divisors is an integer number (10510000010515).

Almost surely, 2^{21020000021029} is an apocalyptic number.

It is an amenable number.

21020000021029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020000021029 is an equidigital number, since it uses as much as digits as its factorization.

21020000021029 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 19.

The spelling of 21020000021029 in words is "twenty-one trillion, twenty billion, twenty-one thousand, twenty-nine".