1213110011021 has 8 divisors (see below), whose sum is σ = 1305526300344. Its totient is φ = 1123033374720.

The previous prime is 1213110011017. The next prime is 1213110011081. The reversal of 1213110011021 is 1201100113121.

It can be written as a sum of positive squares in 4 ways, for example, as 391485796 + 1212718525225 = 19786^2 + 1101235^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213110011021 - 2² = 1213110011017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213110010987 and 1213110011005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213110011011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 584912180 + ... + 584914253.

It is an arithmetic number, because the mean of its divisors is an integer number (163190787543).

Almost surely, 2^{1213110011021} is an apocalyptic number.

It is an amenable number.

1213110011021 is a deficient number, since it is larger than the sum of its proper divisors (92416289323).

1213110011021 is a wasteful number, since it uses less digits than its factorization.

1213110011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169826511.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 1213110011021 its reverse (1201100113121), we get a palindrome (2414210124142).

The spelling of 1213110011021 in words is "one trillion, two hundred thirteen billion, one hundred ten million, eleven thousand, twenty-one".