21125251122 has 8 divisors (see below), whose sum is σ = 42250502256. Its totient is φ = 7041750372.

The previous prime is 21125251111. The next prime is 21125251123. The reversal of 21125251122 is 22115252112.

It is a sphenic number, since it is the product of 3 distinct primes.

21125251122 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21125251092 and 21125251101.

It is not an unprimeable number, because it can be changed into a prime (21125251123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1760437588 + ... + 1760437599.

It is an arithmetic number, because the mean of its divisors is an integer number (5281312782).

Almost surely, 2^21125251122 is an apocalyptic number.

21125251122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21125251122 is a wasteful number, since it uses less digits than its factorization.

21125251122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520875192.

The product of its digits is 800, while the sum is 24.

The spelling of 21125251122 in words is "twenty-one billion, one hundred twenty-five million, two hundred fifty-one thousand, one hundred twenty-two".