1210121311321 has 32 divisors (see below), whose sum is σ = 1340167062528. Its totient is φ = 1085693207040.

The previous prime is 1210121311271. The next prime is 1210121311331. The reversal of 1210121311321 is 1231131210121.

It is not a de Polignac number, because 1210121311321 - 2⁹ = 1210121310809 is a prime.

It is a super-2 number, since 2×1210121311321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210121311331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 336797901 + ... + 336801493.

It is an arithmetic number, because the mean of its divisors is an integer number (41880220704).

Almost surely, 2^{1210121311321} is an apocalyptic number.

It is an amenable number.

1210121311321 is a deficient number, since it is larger than the sum of its proper divisors (130045751207).

1210121311321 is a wasteful number, since it uses less digits than its factorization.

1210121311321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7321.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1210121311321 its reverse (1231131210121), we get a palindrome (2441252521442).

The spelling of 1210121311321 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, three hundred eleven thousand, three hundred twenty-one".