21334001 has 4 divisors (see below), whose sum is σ = 22975092. Its totient is φ = 19692912.

The previous prime is 21333973. The next prime is 21334007. The reversal of 21334001 is 10043312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7974976 + 13359025 = 2824^2 + 3655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21334001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21334007) 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 in 3 ways as a sum of consecutive naturals, for example, 820526 + ... + 820551.

It is an arithmetic number, because the mean of its divisors is an integer number (5743773).

Almost surely, 2^21334001 is an apocalyptic number.

It is an amenable number.

21334001 is a deficient number, since it is larger than the sum of its proper divisors (1641091).

21334001 is a wasteful number, since it uses less digits than its factorization.

21334001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641090.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21334001 is about 4618.8744299883. The cubic root of 21334001 is about 277.3474030489.

Adding to 21334001 its reverse (10043312), we get a palindrome (31377313).

The spelling of 21334001 in words is "twenty-one million, three hundred thirty-four thousand, one".