1320212312021 has 4 divisors (see below), whose sum is σ = 1322048491200. Its totient is φ = 1318376132844.

The previous prime is 1320212311921. The next prime is 1320212312057. The reversal of 1320212312021 is 1202132120231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1320212312021 - 2¹⁴ = 1320212295637 is a prime.

It is a super-2 number, since 2×1320212312021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1320212311984 and 1320212312002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320212812021) 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, 918088511 + ... + 918089948.

It is an arithmetic number, because the mean of its divisors is an integer number (330512122800).

Almost surely, 2^{1320212312021} is an apocalyptic number.

It is an amenable number.

1320212312021 is a deficient number, since it is larger than the sum of its proper divisors (1836179179).

1320212312021 is an equidigital number, since it uses as much as digits as its factorization.

1320212312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836179178.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1320212312021 its reverse (1202132120231), we get a palindrome (2522344432252).

The spelling of 1320212312021 in words is "one trillion, three hundred twenty billion, two hundred twelve million, three hundred twelve thousand, twenty-one".