21120212303 has 2 divisors, whose sum is σ = 21120212304. Its totient is φ = 21120212302.

The previous prime is 21120212291. The next prime is 21120212339. The reversal of 21120212303 is 30321202112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120212303 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120212383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560106151 + 10560106152.

It is an arithmetic number, because the mean of its divisors is an integer number (10560106152).

Almost surely, 2^21120212303 is an apocalyptic number.

21120212303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120212303 is an equidigital number, since it uses as much as digits as its factorization.

21120212303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21120212303 its reverse (30321202112), we get a palindrome (51441414415).

The spelling of 21120212303 in words is "twenty-one billion, one hundred twenty million, two hundred twelve thousand, three hundred three".