21203276705 has 8 divisors (see below), whose sum is σ = 27401157672. Its totient is φ = 15657804288.

The previous prime is 21203276683. The next prime is 21203276711. The reversal of 21203276705 is 50767230212.

It can be written as a sum of positive squares in 4 ways, for example, as 119946304 + 21083330401 = 10952^2 + 145201^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21203276705 - 2²⁴ = 21186499489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163102064 + ... + 163102193.

It is an arithmetic number, because the mean of its divisors is an integer number (3425144709).

Almost surely, 2^21203276705 is an apocalyptic number.

It is an amenable number.

21203276705 is a deficient number, since it is larger than the sum of its proper divisors (6197880967).

21203276705 is a wasteful number, since it uses less digits than its factorization.

21203276705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326204275.

The product of its (nonzero) digits is 35280, while the sum is 35.

The spelling of 21203276705 in words is "twenty-one billion, two hundred three million, two hundred seventy-six thousand, seven hundred five".