21403663235 has 8 divisors (see below), whose sum is σ = 25701181296. Its totient is φ = 17111740320.

The previous prime is 21403663217. The next prime is 21403663241. The reversal of 21403663235 is 53236630412.

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

It is not a de Polignac number, because 21403663235 - 2¹⁸ = 21403401091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21403663195 and 21403663204.

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, 1390364 + ... + 1405673.

It is an arithmetic number, because the mean of its divisors is an integer number (3212647662).

Almost surely, 2^21403663235 is an apocalyptic number.

21403663235 is a deficient number, since it is larger than the sum of its proper divisors (4297518061).

21403663235 is a wasteful number, since it uses less digits than its factorization.

21403663235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2797573.

The product of its (nonzero) digits is 77760, while the sum is 35.

The spelling of 21403663235 in words is "twenty-one billion, four hundred three million, six hundred sixty-three thousand, two hundred thirty-five".