20012401921 has 8 divisors (see below), whose sum is σ = 21280548744. Its totient is φ = 18754360320.

The previous prime is 20012401901. The next prime is 20012401933. The reversal of 20012401921 is 12910421002.

It can be written as a sum of positive squares in 4 ways, for example, as 4091009521 + 15921392400 = 63961^2 + 126180^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20012401921 - 2⁵ = 20012401889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012401892 and 20012401901.

It is not an unprimeable number, because it can be changed into a prime (20012401901) 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, 2522220 + ... + 2530141.

It is an arithmetic number, because the mean of its divisors is an integer number (2660068593).

Almost surely, 2^20012401921 is an apocalyptic number.

It is an amenable number.

20012401921 is a deficient number, since it is larger than the sum of its proper divisors (1268146823).

20012401921 is a wasteful number, since it uses less digits than its factorization.

20012401921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5052611.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 20012401921 its reverse (12910421002), we get a palindrome (32922822923).

The spelling of 20012401921 in words is "twenty billion, twelve million, four hundred one thousand, nine hundred twenty-one".