21203896829 has 2 divisors, whose sum is σ = 21203896830. Its totient is φ = 21203896828.

The previous prime is 21203896807. The next prime is 21203896859. The reversal of 21203896829 is 92869830212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14248003225 + 6955893604 = 119365^2 + 83402^2 .

It is a cyclic number.

It is not a de Polignac number, because 21203896829 - 2¹⁶ = 21203831293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203896859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601948414 + 10601948415.

It is an arithmetic number, because the mean of its divisors is an integer number (10601948415).

Almost surely, 2^21203896829 is an apocalyptic number.

It is an amenable number.

21203896829 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203896829 is an equidigital number, since it uses as much as digits as its factorization.

21203896829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 21203896829 in words is "twenty-one billion, two hundred three million, eight hundred ninety-six thousand, eight hundred twenty-nine".