21121002029 has 2 divisors, whose sum is σ = 21121002030. Its totient is φ = 21121002028.

The previous prime is 21121001969. The next prime is 21121002043. The reversal of 21121002029 is 92020012112.

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., 13870479529 + 7250522500 = 117773^2 + 85150^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121002029 - 2²⁸ = 20852566573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21121002029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121002629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560501014 + 10560501015.

It is an arithmetic number, because the mean of its divisors is an integer number (10560501015).

Almost surely, 2^21121002029 is an apocalyptic number.

It is an amenable number.

21121002029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121002029 is an equidigital number, since it uses as much as digits as its factorization.

21121002029 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 21121002029 in words is "twenty-one billion, one hundred twenty-one million, two thousand, twenty-nine".