21231284903 has 2 divisors, whose sum is σ = 21231284904. Its totient is φ = 21231284902.

The previous prime is 21231284863. The next prime is 21231284909. The reversal of 21231284903 is 30948213212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21231284903 - 2¹⁴ = 21231268519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21231284909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615642451 + 10615642452.

It is an arithmetic number, because the mean of its divisors is an integer number (10615642452).

Almost surely, 2^21231284903 is an apocalyptic number.

21231284903 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231284903 is an equidigital number, since it uses as much as digits as its factorization.

21231284903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 21231284903 in words is "twenty-one billion, two hundred thirty-one million, two hundred eighty-four thousand, nine hundred three".