21237804558053 has 4 divisors (see below), whose sum is σ = 21237962396460. Its totient is φ = 21237646719648.

The previous prime is 21237804558007. The next prime is 21237804558067. The reversal of 21237804558053 is 35085540873212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10083527158849 + 11154277399204 = 3175457^2 + 3339802^2 .

It is a cyclic number.

It is not a de Polignac number, because 21237804558053 - 2¹⁶ = 21237804492517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21237804557986 and 21237804558004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21237804558353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78717200 + ... + 78986537.

It is an arithmetic number, because the mean of its divisors is an integer number (5309490599115).

Almost surely, 2^{21237804558053} is an apocalyptic number.

It is an amenable number.

21237804558053 is a deficient number, since it is larger than the sum of its proper divisors (157838407).

21237804558053 is a wasteful number, since it uses less digits than its factorization.

21237804558053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157838406.

The product of its (nonzero) digits is 8064000, while the sum is 53.

The spelling of 21237804558053 in words is "twenty-one trillion, two hundred thirty-seven billion, eight hundred four million, five hundred fifty-eight thousand, fifty-three".