21102020312029 has 2 divisors, whose sum is σ = 21102020312030. Its totient is φ = 21102020312028.

The previous prime is 21102020312003. The next prime is 21102020312053. The reversal of 21102020312029 is 92021302020112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20902059303129 + 199961008900 = 4571877^2 + 447170^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102020312029 - 2²⁹ = 21101483441117 is a prime.

It is a super-2 number, since 2×21102020312029² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21102020311994 and 21102020312012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102020312929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551010156014 + 10551010156015.

It is an arithmetic number, because the mean of its divisors is an integer number (10551010156015).

Almost surely, 2^{21102020312029} is an apocalyptic number.

It is an amenable number.

21102020312029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102020312029 is an equidigital number, since it uses as much as digits as its factorization.

21102020312029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 21102020312029 in words is "twenty-one trillion, one hundred two billion, twenty million, three hundred twelve thousand, twenty-nine".