1321213011211 has 4 divisors (see below), whose sum is σ = 1321525432800. Its totient is φ = 1320900589624.

The previous prime is 1321213011199. The next prime is 1321213011227. The reversal of 1321213011211 is 1121103121231.

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

It is a cyclic number.

It is not a de Polignac number, because 1321213011211 - 2²¹ = 1321210914059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321213011311) 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, 156204451 + ... + 156212908.

It is an arithmetic number, because the mean of its divisors is an integer number (330381358200).

Almost surely, 2^{1321213011211} is an apocalyptic number.

1321213011211 is a deficient number, since it is larger than the sum of its proper divisors (312421589).

1321213011211 is an equidigital number, since it uses as much as digits as its factorization.

1321213011211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312421588.

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

Adding to 1321213011211 its reverse (1121103121231), we get a palindrome (2442316132442).

The spelling of 1321213011211 in words is "one trillion, three hundred twenty-one billion, two hundred thirteen million, eleven thousand, two hundred eleven".