1210121131021 has 16 divisors (see below), whose sum is σ = 1329106060800. Its totient is φ = 1092633123520.

The previous prime is 1210121130971. The next prime is 1210121131147. The reversal of 1210121131021 is 1201311210121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1210121131021 - 2⁷ = 1210121130893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210121130986 and 1210121131004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210121131421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25237956 + ... + 25285858.

It is an arithmetic number, because the mean of its divisors is an integer number (83069128800).

Almost surely, 2^{1210121131021} is an apocalyptic number.

1210121131021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210121131021 is a deficient number, since it is larger than the sum of its proper divisors (118984929779).

1210121131021 is a wasteful number, since it uses less digits than its factorization.

1210121131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63476.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1210121131021 its reverse (1201311210121), we get a palindrome (2411432341142).

The spelling of 1210121131021 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, one hundred thirty-one thousand, twenty-one".