20011572017121 has 8 divisors (see below), whose sum is σ = 27302609884000. Its totient is φ = 13030791080832.

The previous prime is 20011572017113. The next prime is 20011572017131. The reversal of 20011572017121 is 12171027511002.

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

It is not a de Polignac number, because 20011572017121 - 2³ = 20011572017113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011572017131) 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, 77564232496 + ... + 77564232753.

It is an arithmetic number, because the mean of its divisors is an integer number (3412826235500).

Almost surely, 2^{20011572017121} is an apocalyptic number.

It is an amenable number.

20011572017121 is a deficient number, since it is larger than the sum of its proper divisors (7291037866879).

20011572017121 is a wasteful number, since it uses less digits than its factorization.

20011572017121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155128465295.

The product of its (nonzero) digits is 1960, while the sum is 30.

Adding to 20011572017121 its reverse (12171027511002), we get a palindrome (32182599528123).

The spelling of 20011572017121 in words is "twenty trillion, eleven billion, five hundred seventy-two million, seventeen thousand, one hundred twenty-one".