21277776146 has 16 divisors (see below), whose sum is σ = 36332013888. Its totient is φ = 9251206800.

The previous prime is 21277776103. The next prime is 21277776173. The reversal of 21277776146 is 64167777212.

21277776146 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21277776146² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21277776094 and 21277776103.

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, 21024965 + ... + 21025976.

It is an arithmetic number, because the mean of its divisors is an integer number (2270750868).

Almost surely, 2^21277776146 is an apocalyptic number.

21277776146 is a deficient number, since it is larger than the sum of its proper divisors (15054237742).

21277776146 is a wasteful number, since it uses less digits than its factorization.

21277776146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42050977.

The product of its digits is 1382976, while the sum is 50.

The spelling of 21277776146 in words is "twenty-one billion, two hundred seventy-seven million, seven hundred seventy-six thousand, one hundred forty-six".