21354007 has 2 divisors, whose sum is σ = 21354008. Its totient is φ = 21354006.

The previous prime is 21353993. The next prime is 21354013. The reversal of 21354007 is 70045312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21354007 - 2⁷ = 21353879 is a prime.

It is a super-2 number, since 2×21354007² = 911987229912098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21354017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677003 + 10677004.

It is an arithmetic number, because the mean of its divisors is an integer number (10677004).

Almost surely, 2^21354007 is an apocalyptic number.

21354007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21354007 is an equidigital number, since it uses as much as digits as its factorization.

21354007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21354007 is about 4621.0396016481. The cubic root of 21354007 is about 277.4340703152.

Adding to 21354007 its reverse (70045312), we get a palindrome (91399319).

The spelling of 21354007 in words is "twenty-one million, three hundred fifty-four thousand, seven".