21204223053 has 16 divisors (see below), whose sum is σ = 30461921280. Its totient is φ = 13042396224.

The previous prime is 21204222973. The next prime is 21204223091. The reversal of 21204223053 is 35032240212.

It is not a de Polignac number, because 21204223053 - 2¹⁴ = 21204206669 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204227053) 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, 50701 + ... + 212082.

It is an arithmetic number, because the mean of its divisors is an integer number (1903870080).

Almost surely, 2^21204223053 is an apocalyptic number.

It is an amenable number.

21204223053 is a deficient number, since it is larger than the sum of its proper divisors (9257698227).

21204223053 is a wasteful number, since it uses less digits than its factorization.

21204223053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264868.

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 21204223053 its reverse (35032240212), we get a palindrome (56236463265).

The spelling of 21204223053 in words is "twenty-one billion, two hundred four million, two hundred twenty-three thousand, fifty-three".