21352280053 has 4 divisors (see below), whose sum is σ = 22994763148. Its totient is φ = 19709796960.

The previous prime is 21352280021. The next prime is 21352280101. The reversal of 21352280053 is 35008225312.

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 13279796644 + 8072483409 = 115238^2 + 89847^2 .

It is a cyclic number.

It is not a de Polignac number, because 21352280053 - 2⁵ = 21352280021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21352279997 and 21352280024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352281053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821241528 + ... + 821241553.

It is an arithmetic number, because the mean of its divisors is an integer number (5748690787).

Almost surely, 2^21352280053 is an apocalyptic number.

It is an amenable number.

21352280053 is a deficient number, since it is larger than the sum of its proper divisors (1642483095).

21352280053 is a wasteful number, since it uses less digits than its factorization.

21352280053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642483094.

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 21352280053 in words is "twenty-one billion, three hundred fifty-two million, two hundred eighty thousand, fifty-three".