21125542116 has 48 divisors (see below), whose sum is σ = 59648593536. Its totient is φ = 5680817664.

The previous prime is 21125542073. The next prime is 21125542129. The reversal of 21125542116 is 61124552112.

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 15 ways as a sum of consecutive naturals, for example, 7395471 + ... + 7398326.

It is an arithmetic number, because the mean of its divisors is an integer number (1242679032).

Almost surely, 2^21125542116 is an apocalyptic number.

It is an amenable number.

21125542116 is an abundant number, since it is smaller than the sum of its proper divisors (38523051420).

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

21125542116 is a wasteful number, since it uses less digits than its factorization.

21125542116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14793828 (or 14793826 counting only the distinct ones).

The product of its digits is 4800, while the sum is 30.

The spelling of 21125542116 in words is "twenty-one billion, one hundred twenty-five million, five hundred forty-two thousand, one hundred sixteen".