21204103001 has 4 divisors (see below), whose sum is σ = 21218250000. Its totient is φ = 21189956004.

The previous prime is 21204102991. The next prime is 21204103021. The reversal of 21204103001 is 10030140212.

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 a de Polignac number, because none of the positive numbers 2^k-21204103001 is a prime.

It is a super-2 number, since 2×21204103001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21204103021) 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, 7071251 + ... + 7074248.

It is an arithmetic number, because the mean of its divisors is an integer number (5304562500).

Almost surely, 2^21204103001 is an apocalyptic number.

It is an amenable number.

21204103001 is a deficient number, since it is larger than the sum of its proper divisors (14146999).

21204103001 is a wasteful number, since it uses less digits than its factorization.

21204103001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14146998.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21204103001 its reverse (10030140212), we get a palindrome (31234243213).

The spelling of 21204103001 in words is "twenty-one billion, two hundred four million, one hundred three thousand, one".