21480922985 has 8 divisors (see below), whose sum is σ = 27293408136. Its totient is φ = 16173871360.

The previous prime is 21480922973. The next prime is 21480922993. The reversal of 21480922985 is 58922908412.

It can be written as a sum of positive squares in 4 ways, for example, as 11159175769 + 10321747216 = 105637^2 + 101596^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21480922985 - 2¹⁶ = 21480857449 is a prime.

It is a super-2 number, since 2×21480922985² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126358286 + ... + 126358455.

It is an arithmetic number, because the mean of its divisors is an integer number (3411676017).

Almost surely, 2^21480922985 is an apocalyptic number.

It is an amenable number.

21480922985 is a deficient number, since it is larger than the sum of its proper divisors (5812485151).

21480922985 is a wasteful number, since it uses less digits than its factorization.

21480922985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252716763.

The product of its (nonzero) digits is 829440, while the sum is 50.

The spelling of 21480922985 in words is "twenty-one billion, four hundred eighty million, nine hundred twenty-two thousand, nine hundred eighty-five".