21004400201 has 8 divisors (see below), whose sum is σ = 22241477664. Its totient is φ = 19767492160.

The previous prime is 21004400141. The next prime is 21004400203. The reversal of 21004400201 is 10200440012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21004400201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21004400203) 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, 285446 + ... + 351408.

It is an arithmetic number, because the mean of its divisors is an integer number (2780184708).

Almost surely, 2^21004400201 is an apocalyptic number.

It is an amenable number.

21004400201 is a deficient number, since it is larger than the sum of its proper divisors (1237077463).

21004400201 is a wasteful number, since it uses less digits than its factorization.

21004400201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84711.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21004400201 its reverse (10200440012), we get a palindrome (31204840213).

The spelling of 21004400201 in words is "twenty-one billion, four million, four hundred thousand, two hundred one".