21481303069 has 4 divisors (see below), whose sum is σ = 21693989340. Its totient is φ = 21268616800.

The previous prime is 21481303033. The next prime is 21481303147. The reversal of 21481303069 is 96030318412.

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 20642505625 + 838797444 = 143675^2 + 28962^2 .

It is a cyclic number.

It is not a de Polignac number, because 21481303069 - 2¹⁷ = 21481171997 is a prime.

It is a super-2 number, since 2×21481303069² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21487303069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106342984 + ... + 106343185.

It is an arithmetic number, because the mean of its divisors is an integer number (5423497335).

Almost surely, 2^21481303069 is an apocalyptic number.

It is an amenable number.

21481303069 is a deficient number, since it is larger than the sum of its proper divisors (212686271).

21481303069 is a wasteful number, since it uses less digits than its factorization.

21481303069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212686270.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 21481303069 in words is "twenty-one billion, four hundred eighty-one million, three hundred three thousand, sixty-nine".