21854467 has 2 divisors, whose sum is σ = 21854468. Its totient is φ = 21854466.

The previous prime is 21854461. The next prime is 21854471. The reversal of 21854467 is 76445812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21854467 is a prime.

It is not a weakly prime, because it can be changed into another prime (21854461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10927233 + 10927234.

It is an arithmetic number, because the mean of its divisors is an integer number (10927234).

Almost surely, 2^21854467 is an apocalyptic number.

21854467 is a deficient number, since it is larger than the sum of its proper divisors (1).

21854467 is an equidigital number, since it uses as much as digits as its factorization.

21854467 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 37.

The square root of 21854467 is about 4674.8761480921. The cubic root of 21854467 is about 279.5847032127.

The spelling of 21854467 in words is "twenty-one million, eight hundred fifty-four thousand, four hundred sixty-seven".