21123467 has 2 divisors, whose sum is σ = 21123468. Its totient is φ = 21123466.

The previous prime is 21123461. The next prime is 21123491. The reversal of 21123467 is 76432112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21123467 - 2⁸ = 21123211 is a prime.

It is not a weakly prime, because it can be changed into another prime (21123461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561733 + 10561734.

It is an arithmetic number, because the mean of its divisors is an integer number (10561734).

Almost surely, 2^21123467 is an apocalyptic number.

21123467 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123467 is an equidigital number, since it uses as much as digits as its factorization.

21123467 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 26.

The square root of 21123467 is about 4596.0273062722. The cubic root of 21123467 is about 276.4320536490.

Adding to 21123467 its reverse (76432112), we get a palindrome (97555579).

The spelling of 21123467 in words is "twenty-one million, one hundred twenty-three thousand, four hundred sixty-seven".