21348207 has 6 divisors (see below), whose sum is σ = 30836312. Its totient is φ = 14232132.

The previous prime is 21348203. The next prime is 21348211. The reversal of 21348207 is 70284312.

It is an interprime number because it is at equal distance from previous prime (21348203) and next prime (21348211).

It is not a de Polignac number, because 21348207 - 2² = 21348203 is a prime.

It is a super-2 number, since 2×21348207² = 911491884229698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21348203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1186003 + ... + 1186020.

Almost surely, 2^21348207 is an apocalyptic number.

21348207 is a deficient number, since it is larger than the sum of its proper divisors (9488105).

21348207 is a wasteful number, since it uses less digits than its factorization.

21348207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2372029 (or 2372026 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 21348207 is about 4620.4119946169. The cubic root of 21348207 is about 277.4089499196.

The spelling of 21348207 in words is "twenty-one million, three hundred forty-eight thousand, two hundred seven".