20211000121 has 8 divisors (see below), whose sum is σ = 22010252040. Its totient is φ = 18446685312.

The previous prime is 20211000097. The next prime is 20211000167. The reversal of 20211000121 is 12100011202.

It can be written as a sum of positive squares in 4 ways, for example, as 3023790121 + 17187210000 = 54989^2 + 131100^2 .

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 20211000121 - 2²¹ = 20208902969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211000098 and 20211000107.

It is not an unprimeable number, because it can be changed into a prime (20211000221) 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, 8733070 + ... + 8735383.

It is an arithmetic number, because the mean of its divisors is an integer number (2751281505).

Almost surely, 2^20211000121 is an apocalyptic number.

It is an amenable number.

20211000121 is a deficient number, since it is larger than the sum of its proper divisors (1799251919).

20211000121 is a wasteful number, since it uses less digits than its factorization.

20211000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17468555.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20211000121 its reverse (12100011202), we get a palindrome (32311011323).

The spelling of 20211000121 in words is "twenty billion, two hundred eleven million, one hundred twenty-one", and thus it is an aban number.