20001203121 has 8 divisors (see below), whose sum is σ = 27827760960. Its totient is φ = 12754390352.

The previous prime is 20001203099. The next prime is 20001203147. The reversal of 20001203121 is 12130210002.

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 20001203121 - 2¹⁸ = 20000940977 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20001203097 and 20001203106.

It is not an unprimeable number, because it can be changed into a prime (20001203221) 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, 144936186 + ... + 144936323.

It is an arithmetic number, because the mean of its divisors is an integer number (3478470120).

Almost surely, 2^20001203121 is an apocalyptic number.

It is an amenable number.

20001203121 is a deficient number, since it is larger than the sum of its proper divisors (7826557839).

20001203121 is a wasteful number, since it uses less digits than its factorization.

20001203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289872535.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20001203121 its reverse (12130210002), we get a palindrome (32131413123).

The spelling of 20001203121 in words is "twenty billion, one million, two hundred three thousand, one hundred twenty-one".