2021111002121 has 4 divisors (see below), whose sum is σ = 2041122002244.
Its totient is φ = 2001100002000.
The previous prime is 2021111002033. The next prime is 2021111002139. The reversal of 2021111002121 is 1212001111202.
Adding to 2021111002121 its reverse (1212001111202), we get a palindrome (3233112113323).
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 1869837456400 + 151273545721 = 1367420^2 + 388939^2
It is a cyclic number.
It is not a de Polignac number, because 2021111002121 - 210 = 2021111001097 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 = 2021111002096 and 2021111002105.
It is not an unprimeable number, because it can be changed into a prime (2021111007121) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10005499910 + ... + 10005500111.
It is an arithmetic number, because the mean of its divisors is an integer number (510280500561).
Almost surely, 22021111002121 is an apocalyptic number.
It is an amenable number.
2021111002121 is a deficient number, since it is larger than the sum of its proper divisors (20011000123).
2021111002121 is a wasteful number, since it uses less digits than its factorization.
2021111002121 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 20011000122.
The product of its (nonzero) digits is 16, while the sum is 14.
The spelling of 2021111002121 in words is "two trillion, twenty-one billion, one hundred eleven million, two thousand, one hundred twenty-one".