1210121021121 has 16 divisors (see below), whose sum is σ = 1701874602240. Its totient is φ = 762730350480.

The previous prime is 1210121021119. The next prime is 1210121021167. The reversal of 1210121021121 is 1211201210121.

It is a happy number.

It is not a de Polignac number, because 1210121021121 - 2¹ = 1210121021119 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1210121021121.

It is not an unprimeable number, because it can be changed into a prime (1210121021191) 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, 21591355 + ... + 21647328.

It is an arithmetic number, because the mean of its divisors is an integer number (106367162640).

Almost surely, 2^{1210121021121} is an apocalyptic number.

It is an amenable number.

1210121021121 is a deficient number, since it is larger than the sum of its proper divisors (491753581119).

1210121021121 is a wasteful number, since it uses less digits than its factorization.

1210121021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43239196.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1210121021121 its reverse (1211201210121), we get a palindrome (2421322231242).

The spelling of 1210121021121 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, twenty-one thousand, one hundred twenty-one".