21282707903 has 4 divisors (see below), whose sum is σ = 21294606120. Its totient is φ = 21270809688.

The previous prime is 21282707869. The next prime is 21282707923. The reversal of 21282707903 is 30970728212.

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 21282707903 - 2¹⁸ = 21282445759 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 (21282707923) 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, 5946425 + ... + 5950002.

It is an arithmetic number, because the mean of its divisors is an integer number (5323651530).

Almost surely, 2^21282707903 is an apocalyptic number.

21282707903 is a deficient number, since it is larger than the sum of its proper divisors (11898217).

21282707903 is a wasteful number, since it uses less digits than its factorization.

21282707903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11898216.

The product of its (nonzero) digits is 84672, while the sum is 41.

The spelling of 21282707903 in words is "twenty-one billion, two hundred eighty-two million, seven hundred seven thousand, nine hundred three".