21495407 has 2 divisors, whose sum is σ = 21495408. Its totient is φ = 21495406.

The previous prime is 21495401. The next prime is 21495413. The reversal of 21495407 is 70459412.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (21495401) and next prime (21495413).

It is a cyclic number.

It is not a de Polignac number, because 21495407 - 2⁴ = 21495391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21495401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10747703 + 10747704.

It is an arithmetic number, because the mean of its divisors is an integer number (10747704).

Almost surely, 2^21495407 is an apocalyptic number.

21495407 is a deficient number, since it is larger than the sum of its proper divisors (1).

21495407 is an equidigital number, since it uses as much as digits as its factorization.

21495407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 21495407 is about 4636.3139453665. The cubic root of 21495407 is about 278.0450861092.

The spelling of 21495407 in words is "twenty-one million, four hundred ninety-five thousand, four hundred seven".