20512640121 has 8 divisors (see below), whose sum is σ = 27360483360. Its totient is φ = 13669945152.

The previous prime is 20512640117. The next prime is 20512640143. The reversal of 20512640121 is 12104621502.

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

It is not a de Polignac number, because 20512640121 - 2² = 20512640117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20512640091 and 20512640100.

It is not an unprimeable number, because it can be changed into a prime (20512640171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1277760 + ... + 1293713.

It is an arithmetic number, because the mean of its divisors is an integer number (3420060420).

Almost surely, 2^20512640121 is an apocalyptic number.

It is an amenable number.

20512640121 is a deficient number, since it is larger than the sum of its proper divisors (6847843239).

20512640121 is a wasteful number, since it uses less digits than its factorization.

20512640121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2574135.

The product of its (nonzero) digits is 960, while the sum is 24.

The spelling of 20512640121 in words is "twenty billion, five hundred twelve million, six hundred forty thousand, one hundred twenty-one".