1321011211 has 4 divisors (see below), whose sum is σ = 1422627472. Its totient is φ = 1219394952.

The previous prime is 1321011173. The next prime is 1321011217. The reversal of 1321011211 is 1121101231.

It is a happy number.

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 1321011211 - 2²³ = 1312622603 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 101616247 = 1321011211 / (1 + 3 + 2 + 1 + 0 + 1 + 1 + 2 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321011191 and 1321011200.

It is not an unprimeable number, because it can be changed into a prime (1321011217) 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, 50808111 + ... + 50808136.

It is an arithmetic number, because the mean of its divisors is an integer number (355656868).

Almost surely, 2^1321011211 is an apocalyptic number.

1321011211 is a deficient number, since it is larger than the sum of its proper divisors (101616261).

1321011211 is a wasteful number, since it uses less digits than its factorization.

1321011211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101616260.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1321011211 is about 36345.7179183463. The cubic root of 1321011211 is about 1097.2413549835.

Adding to 1321011211 its reverse (1121101231), we get a palindrome (2442112442).

The spelling of 1321011211 in words is "one billion, three hundred twenty-one million, eleven thousand, two hundred eleven".