21000329629 has 2 divisors, whose sum is σ = 21000329630. Its totient is φ = 21000329628.

The previous prime is 21000329621. The next prime is 21000329657. The reversal of 21000329629 is 92692300012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20825376100 + 174953529 = 144310^2 + 13227^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000329629 - 2³ = 21000329621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21000329594 and 21000329603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000329621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500164814 + 10500164815.

It is an arithmetic number, because the mean of its divisors is an integer number (10500164815).

Almost surely, 2^21000329629 is an apocalyptic number.

It is an amenable number.

21000329629 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000329629 is an equidigital number, since it uses as much as digits as its factorization.

21000329629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 21000329629 in words is "twenty-one billion, three hundred twenty-nine thousand, six hundred twenty-nine".