21268949323 has 2 divisors, whose sum is σ = 21268949324. Its totient is φ = 21268949322.

The previous prime is 21268949311. The next prime is 21268949329. The reversal of 21268949323 is 32394986212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21268949323 - 2¹³ = 21268941131 is a prime.

It is not a weakly prime, because it can be changed into another prime (21268949329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10634474661 + 10634474662.

It is an arithmetic number, because the mean of its divisors is an integer number (10634474662).

Almost surely, 2^21268949323 is an apocalyptic number.

21268949323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21268949323 is an equidigital number, since it uses as much as digits as its factorization.

21268949323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 49.

The spelling of 21268949323 in words is "twenty-one billion, two hundred sixty-eight million, nine hundred forty-nine thousand, three hundred twenty-three".