21863952403 has 4 divisors (see below), whose sum is σ = 23014686760. Its totient is φ = 20713218048.

The previous prime is 21863952391. The next prime is 21863952463. The reversal of 21863952403 is 30425936812.

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

It is a cyclic number.

It is not a de Polignac number, because 21863952403 - 2⁹ = 21863951891 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21863952403.

It is not an unprimeable number, because it can be changed into a prime (21863952463) 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, 575367150 + ... + 575367187.

It is an arithmetic number, because the mean of its divisors is an integer number (5753671690).

Almost surely, 2^21863952403 is an apocalyptic number.

21863952403 is a deficient number, since it is larger than the sum of its proper divisors (1150734357).

21863952403 is a wasteful number, since it uses less digits than its factorization.

21863952403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150734356.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 21863952403 in words is "twenty-one billion, eight hundred sixty-three million, nine hundred fifty-two thousand, four hundred three".