21204043401 has 8 divisors (see below), whose sum is σ = 28344738240. Its totient is φ = 14099688752.

The previous prime is 21204043387. The next prime is 21204043411. The reversal of 21204043401 is 10434040212.

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

It is a cyclic number.

It is not a de Polignac number, because 21204043401 - 2⁶ = 21204043337 is a prime.

It is a super-2 number, since 2×21204043401² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21204043411) 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, 9083685 + ... + 9086018.

It is an arithmetic number, because the mean of its divisors is an integer number (3543092280).

Almost surely, 2^21204043401 is an apocalyptic number.

It is an amenable number.

21204043401 is a deficient number, since it is larger than the sum of its proper divisors (7140694839).

21204043401 is a wasteful number, since it uses less digits than its factorization.

21204043401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18170095.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21204043401 its reverse (10434040212), we get a palindrome (31638083613).

The spelling of 21204043401 in words is "twenty-one billion, two hundred four million, forty-three thousand, four hundred one".