1012121213321 has 4 divisors (see below), whose sum is σ = 1013391127812. Its totient is φ = 1010851298832.

The previous prime is 1012121213309. The next prime is 1012121213387. The reversal of 1012121213321 is 1233121212101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 808900573321 + 203220640000 = 899389^2 + 450800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012121213321 - 2¹⁴ = 1012121196937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1012121213293 and 1012121213302.

It is not an unprimeable number, because it can be changed into a prime (1012121213221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 634956050 + ... + 634957643.

It is an arithmetic number, because the mean of its divisors is an integer number (253347781953).

Almost surely, 2^{1012121213321} is an apocalyptic number.

It is an amenable number.

1012121213321 is a deficient number, since it is larger than the sum of its proper divisors (1269914491).

1012121213321 is an equidigital number, since it uses as much as digits as its factorization.

1012121213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269914490.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1012121213321 its reverse (1233121212101), we get a palindrome (2245242425422).

The spelling of 1012121213321 in words is "one trillion, twelve billion, one hundred twenty-one million, two hundred thirteen thousand, three hundred twenty-one".