21116219228 has 24 divisors (see below), whose sum is σ = 39857523552. Its totient is φ = 9730868544.

The previous prime is 21116219227. The next prime is 21116219251. The reversal of 21116219228 is 82291261112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116219227) 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 7 ways as a sum of consecutive naturals, for example, 280175 + ... + 347462.

It is an arithmetic number, because the mean of its divisors is an integer number (1660730148).

Almost surely, 2^21116219228 is an apocalyptic number.

It is an amenable number.

21116219228 is a deficient number, since it is larger than the sum of its proper divisors (18741304324).

21116219228 is a wasteful number, since it uses less digits than its factorization.

21116219228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628301 (or 628299 counting only the distinct ones).

The product of its digits is 6912, while the sum is 35.

The spelling of 21116219228 in words is "twenty-one billion, one hundred sixteen million, two hundred nineteen thousand, two hundred twenty-eight".