20041520021 has 4 divisors (see below), whose sum is σ = 20153484000. Its totient is φ = 19929556044.

The previous prime is 20041520003. The next prime is 20041520027. The reversal of 20041520021 is 12002514002.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12002514002 = 2 ⋅6001257001.

It is a cyclic number.

It is not a de Polignac number, because 20041520021 - 2⁶ = 20041519957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20041520027) 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, 55981721 + ... + 55982078.

It is an arithmetic number, because the mean of its divisors is an integer number (5038371000).

Almost surely, 2^20041520021 is an apocalyptic number.

It is an amenable number.

20041520021 is a deficient number, since it is larger than the sum of its proper divisors (111963979).

20041520021 is a wasteful number, since it uses less digits than its factorization.

20041520021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111963978.

The product of its (nonzero) digits is 160, while the sum is 17.

The spelling of 20041520021 in words is "twenty billion, forty-one million, five hundred twenty thousand, twenty-one".