21478122862 has 16 divisors (see below), whose sum is σ = 37571061600. Its totient is φ = 9204909504.

The previous prime is 21478122829. The next prime is 21478122871. The reversal of 21478122862 is 26822187412.

It is a super-2 number, since 2×21478122862² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15653923 + ... + 15655294.

It is an arithmetic number, because the mean of its divisors is an integer number (2348191350).

Almost surely, 2^21478122862 is an apocalyptic number.

21478122862 is a deficient number, since it is larger than the sum of its proper divisors (16092938738).

21478122862 is an equidigital number, since it uses as much as digits as its factorization.

21478122862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31309240 (or 31309226 counting only the distinct ones).

The product of its digits is 172032, while the sum is 43.

The spelling of 21478122862 in words is "twenty-one billion, four hundred seventy-eight million, one hundred twenty-two thousand, eight hundred sixty-two".