20021203121 has 8 divisors (see below), whose sum is σ = 20155094880. Its totient is φ = 19887446592.

The previous prime is 20021203117. The next prime is 20021203207. The reversal of 20021203121 is 12130212002.

It is a happy number.

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 20021203121 - 2² = 20021203117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021203096 and 20021203105.

It is not an unprimeable number, because it can be changed into a prime (20021293121) 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, 272510 + ... + 338088.

It is an arithmetic number, because the mean of its divisors is an integer number (2519386860).

Almost surely, 2^20021203121 is an apocalyptic number.

It is an amenable number.

20021203121 is a deficient number, since it is larger than the sum of its proper divisors (133891759).

20021203121 is a wasteful number, since it uses less digits than its factorization.

20021203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67615.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20021203121 its reverse (12130212002), we get a palindrome (32151415123).

The spelling of 20021203121 in words is "twenty billion, twenty-one million, two hundred three thousand, one hundred twenty-one".