20036565121 has 4 divisors (see below), whose sum is σ = 21091121200. Its totient is φ = 18982009044.

The previous prime is 20036565077. The next prime is 20036565169. The reversal of 20036565121 is 12156563002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20036565121 - 2¹¹ = 20036563073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20036565221) 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, 527278011 + ... + 527278048.

It is an arithmetic number, because the mean of its divisors is an integer number (5272780300).

Almost surely, 2^20036565121 is an apocalyptic number.

It is an amenable number.

20036565121 is a deficient number, since it is larger than the sum of its proper divisors (1054556079).

20036565121 is a wasteful number, since it uses less digits than its factorization.

20036565121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054556078.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 20036565121 in words is "twenty billion, thirty-six million, five hundred sixty-five thousand, one hundred twenty-one".