1210021222121 has 4 divisors (see below), whose sum is σ = 1210802386500. Its totient is φ = 1209240057744.

The previous prime is 1210021222093. The next prime is 1210021222153. The reversal of 1210021222121 is 1212221200121.

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 267636536896 + 942384685225 = 517336^2 + 970765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210021222121 - 2³⁰ = 1208947480297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1210021222121.

It is not an unprimeable number, because it can be changed into a prime (1210021224121) 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, 390579866 + ... + 390582963.

It is an arithmetic number, because the mean of its divisors is an integer number (302700596625).

Almost surely, 2^{1210021222121} is an apocalyptic number.

It is an amenable number.

1210021222121 is a deficient number, since it is larger than the sum of its proper divisors (781164379).

1210021222121 is an equidigital number, since it uses as much as digits as its factorization.

1210021222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781164378.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1210021222121 its reverse (1212221200121), we get a palindrome (2422242422242).

The spelling of 1210021222121 in words is "one trillion, two hundred ten billion, twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".