21340501 has 8 divisors (see below), whose sum is σ = 26265344. Its totient is φ = 16884720.

The previous prime is 21340489. The next prime is 21340511. The reversal of 21340501 is 10504312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21340501 - 2⁵ = 21340469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117165 + ... + 117346.

It is an arithmetic number, because the mean of its divisors is an integer number (3283168).

Almost surely, 2^21340501 is an apocalyptic number.

It is an amenable number.

21340501 is a deficient number, since it is larger than the sum of its proper divisors (4924843).

21340501 is a wasteful number, since it uses less digits than its factorization.

21340501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234531.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21340501 is about 4619.5780110309. The cubic root of 21340501 is about 277.3755674028.

Adding to 21340501 its reverse (10504312), we get a palindrome (31844813).

The spelling of 21340501 in words is "twenty-one million, three hundred forty thousand, five hundred one".