1020212121121 has 8 divisors (see below), whose sum is σ = 1082790460584. Its totient is φ = 957918877440.

The previous prime is 1020212121079. The next prime is 1020212121151. The reversal of 1020212121121 is 1211212120201.

It can be written as a sum of positive squares in 4 ways, for example, as 169879162896 + 850332958225 = 412164^2 + 922135^2 .

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 1020212121121 - 2²¹ = 1020210023969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020212121095 and 1020212121104.

It is not an unprimeable number, because it can be changed into a prime (1020212121151) 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, 71266570 + ... + 71280883.

It is an arithmetic number, because the mean of its divisors is an integer number (135348807573).

Almost surely, 2^{1020212121121} is an apocalyptic number.

It is an amenable number.

1020212121121 is a deficient number, since it is larger than the sum of its proper divisors (62578339463).

1020212121121 is a wasteful number, since it uses less digits than its factorization.

1020212121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142547891.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1020212121121 its reverse (1211212120201), we get a palindrome (2231424241322).

The spelling of 1020212121121 in words is "one trillion, twenty billion, two hundred twelve million, one hundred twenty-one thousand, one hundred twenty-one".