20211020121 has 8 divisors (see below), whose sum is σ = 27817318144. Its totient is φ = 13039367760.

The previous prime is 20211020113. The next prime is 20211020147. The reversal of 20211020121 is 12102011202.

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

It is not a de Polignac number, because 20211020121 - 2³ = 20211020113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211020097 and 20211020106.

It is not an unprimeable number, because it can be changed into a prime (20211020171) 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, 108661306 + ... + 108661491.

It is an arithmetic number, because the mean of its divisors is an integer number (3477164768).

Almost surely, 2^20211020121 is an apocalyptic number.

It is an amenable number.

20211020121 is a deficient number, since it is larger than the sum of its proper divisors (7606298023).

20211020121 is a wasteful number, since it uses less digits than its factorization.

20211020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217322831.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20211020121 its reverse (12102011202), we get a palindrome (32313031323).

The spelling of 20211020121 in words is "twenty billion, two hundred eleven million, twenty thousand, one hundred twenty-one".