1210202021121 has 16 divisors (see below), whose sum is σ = 1657249201344. Its totient is φ = 784979031744.

The previous prime is 1210202021089. The next prime is 1210202021143. The reversal of 1210202021121 is 1211202020121.

It is not a de Polignac number, because 1210202021121 - 2⁵ = 1210202021089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1210202021121.

It is not an unprimeable number, because it can be changed into a prime (1210202021221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7018486 + ... + 7188848.

It is an arithmetic number, because the mean of its divisors is an integer number (103578075084).

Almost surely, 2^{1210202021121} is an apocalyptic number.

It is an amenable number.

1210202021121 is a deficient number, since it is larger than the sum of its proper divisors (447047180223).

1210202021121 is a wasteful number, since it uses less digits than its factorization.

1210202021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234400.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1210202021121 its reverse (1211202020121), we get a palindrome (2421404041242).

The spelling of 1210202021121 in words is "one trillion, two hundred ten billion, two hundred two million, twenty-one thousand, one hundred twenty-one".