20851625121 has 8 divisors (see below), whose sum is σ = 27892728864. Its totient is φ = 13855802400.

The previous prime is 20851625101. The next prime is 20851625149. The reversal of 20851625121 is 12152615802.

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

It is not a de Polignac number, because 20851625121 - 2¹⁷ = 20851494049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20851625101) 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, 11319180 + ... + 11321021.

It is an arithmetic number, because the mean of its divisors is an integer number (3486591108).

Almost surely, 2^20851625121 is an apocalyptic number.

It is an amenable number.

20851625121 is a deficient number, since it is larger than the sum of its proper divisors (7041103743).

20851625121 is a wasteful number, since it uses less digits than its factorization.

20851625121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22640511.

The product of its (nonzero) digits is 9600, while the sum is 33.

The spelling of 20851625121 in words is "twenty billion, eight hundred fifty-one million, six hundred twenty-five thousand, one hundred twenty-one".