21004203001 has 8 divisors (see below), whose sum is σ = 22659363144. Its totient is φ = 19395667200.

The previous prime is 21004202993. The next prime is 21004203029. The reversal of 21004203001 is 10030240012.

It can be written as a sum of positive squares in 4 ways, for example, as 6531872400 + 14472330601 = 80820^2 + 120301^2 .

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

It is not a de Polignac number, because 21004203001 - 2³ = 21004202993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21004203061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11655150 + ... + 11656951.

It is an arithmetic number, because the mean of its divisors is an integer number (2832420393).

Almost surely, 2^21004203001 is an apocalyptic number.

It is an amenable number.

21004203001 is a deficient number, since it is larger than the sum of its proper divisors (1655160143).

21004203001 is a wasteful number, since it uses less digits than its factorization.

21004203001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23312171.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21004203001 its reverse (10030240012), we get a palindrome (31034443013).

The spelling of 21004203001 in words is "twenty-one billion, four million, two hundred three thousand, one".