21004214001 has 4 divisors (see below), whose sum is σ = 28005618672. Its totient is φ = 14002809332.

The previous prime is 21004213987. The next prime is 21004214027. The reversal of 21004214001 is 10041240012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21004214001 - 2⁵ = 21004213969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21004214201) 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, 3500702331 + ... + 3500702336.

It is an arithmetic number, because the mean of its divisors is an integer number (7001404668).

Almost surely, 2^21004214001 is an apocalyptic number.

It is an amenable number.

21004214001 is a deficient number, since it is larger than the sum of its proper divisors (7001404671).

21004214001 is an equidigital number, since it uses as much as digits as its factorization.

21004214001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7001404670.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21004214001 its reverse (10041240012), we get a palindrome (31045454013).

The spelling of 21004214001 in words is "twenty-one billion, four million, two hundred fourteen thousand, one".