21707343 has 18 divisors (see below), whose sum is σ = 36474984. Its totient is φ = 12403944.

The previous prime is 21707321. The next prime is 21707359. The reversal of 21707343 is 34370712.

It is not a de Polignac number, because 21707343 - 2⁸ = 21707087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21707393) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 24171 + ... + 25052.

It is an arithmetic number, because the mean of its divisors is an integer number (2026388).

Almost surely, 2^21707343 is an apocalyptic number.

21707343 is a deficient number, since it is larger than the sum of its proper divisors (14767641).

21707343 is a wasteful number, since it uses less digits than its factorization.

21707343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49243 (or 49233 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 21707343 is about 4659.1139715615. The cubic root of 21707343 is about 278.9559031552.

The spelling of 21707343 in words is "twenty-one million, seven hundred seven thousand, three hundred forty-three".