21158225116 has 24 divisors (see below), whose sum is σ = 42337543136. Its totient is φ = 9063290880.

The previous prime is 21158225107. The next prime is 21158225117. The reversal of 21158225116 is 61152285112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21158225117) by changing a digit.

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, 130845 + ... + 243796.

Almost surely, 2^21158225116 is an apocalyptic number.

It is an amenable number.

21158225116 is an abundant number, since it is smaller than the sum of its proper divisors (21179318020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21158225116 is a wasteful number, since it uses less digits than its factorization.

21158225116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376669 (or 376667 counting only the distinct ones).

The product of its digits is 9600, while the sum is 34.

The spelling of 21158225116 in words is "twenty-one billion, one hundred fifty-eight million, two hundred twenty-five thousand, one hundred sixteen".