21306477053 has 16 divisors (see below), whose sum is σ = 22339950336. Its totient is φ = 20303200320.

The previous prime is 21306477037. The next prime is 21306477061. The reversal of 21306477053 is 35077460312.

It is a cyclic number.

It is not a de Polignac number, because 21306477053 - 2⁴ = 21306477037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21306476998 and 21306477016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21306477853) 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 15 ways as a sum of consecutive naturals, for example, 293675 + ... + 358967.

It is an arithmetic number, because the mean of its divisors is an integer number (1396246896).

Almost surely, 2^21306477053 is an apocalyptic number.

It is an amenable number.

21306477053 is a deficient number, since it is larger than the sum of its proper divisors (1033473283).

21306477053 is a wasteful number, since it uses less digits than its factorization.

21306477053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65524.

The product of its (nonzero) digits is 105840, while the sum is 38.

The spelling of 21306477053 in words is "twenty-one billion, three hundred six million, four hundred seventy-seven thousand, fifty-three".