21034001 has 4 divisors (see below), whose sum is σ = 21322212. Its totient is φ = 20745792.

The previous prime is 21033989. The next prime is 21034003. The reversal of 21034001 is 10043012.

It is a happy number.

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 17648401 + 3385600 = 4201^2 + 1840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21034001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143996 + ... + 144141.

It is an arithmetic number, because the mean of its divisors is an integer number (5330553).

Almost surely, 2^21034001 is an apocalyptic number.

It is an amenable number.

21034001 is a deficient number, since it is larger than the sum of its proper divisors (288211).

21034001 is an equidigital number, since it uses as much as digits as its factorization.

21034001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288210.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21034001 is about 4586.2840077780. The cubic root of 21034001 is about 276.0412360498.

Adding to 21034001 its reverse (10043012), we get a palindrome (31077013).

The spelling of 21034001 in words is "twenty-one million, thirty-four thousand, one".