21629076829 has 4 divisors (see below), whose sum is σ = 22901375484. Its totient is φ = 20356778176.

The previous prime is 21629076827. The next prime is 21629076851. The reversal of 21629076829 is 92867092612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19351592100 + 2277484729 = 139110^2 + 47723^2 .

It is a cyclic number.

It is not a de Polignac number, because 21629076829 - 2¹ = 21629076827 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21629076827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636149302 + ... + 636149335.

It is an arithmetic number, because the mean of its divisors is an integer number (5725343871).

Almost surely, 2^21629076829 is an apocalyptic number.

It is an amenable number.

21629076829 is a deficient number, since it is larger than the sum of its proper divisors (1272298655).

21629076829 is a wasteful number, since it uses less digits than its factorization.

21629076829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272298654.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 21629076829 in words is "twenty-one billion, six hundred twenty-nine million, seventy-six thousand, eight hundred twenty-nine".