20020021012121 has 8 divisors (see below), whose sum is σ = 21881814011904. Its totient is φ = 18204198210000.

The previous prime is 20020021012111. The next prime is 20020021012177. The reversal of 20020021012121 is 12121012002002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020021012121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20020021012096 and 20020021012105.

It is not an unprimeable number, because it can be changed into a prime (20020021012111) 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, 11492548505 + ... + 11492550246.

It is an arithmetic number, because the mean of its divisors is an integer number (2735226751488).

Almost surely, 2^{20020021012121} is an apocalyptic number.

It is an amenable number.

20020021012121 is a deficient number, since it is larger than the sum of its proper divisors (1861792999783).

20020021012121 is a wasteful number, since it uses less digits than its factorization.

20020021012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22985098831.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20020021012121 its reverse (12121012002002), we get a palindrome (32141033014123).

The spelling of 20020021012121 in words is "twenty trillion, twenty billion, twenty-one million, twelve thousand, one hundred twenty-one".