21204342201 has 16 divisors (see below), whose sum is σ = 32440117248. Its totient is φ = 12068490000.

The previous prime is 21204342169. The next prime is 21204342223. The reversal of 21204342201 is 10224340212.

It is not a de Polignac number, because 21204342201 - 2⁵ = 21204342169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21204342251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2006145 + ... + 2016686.

It is an arithmetic number, because the mean of its divisors is an integer number (2027507328).

Almost surely, 2^21204342201 is an apocalyptic number.

21204342201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21204342201 is a deficient number, since it is larger than the sum of its proper divisors (11235775047).

21204342201 is a wasteful number, since it uses less digits than its factorization.

21204342201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4023092.

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

Adding to 21204342201 its reverse (10224340212), we get a palindrome (31428682413).

The spelling of 21204342201 in words is "twenty-one billion, two hundred four million, three hundred forty-two thousand, two hundred one".