1021211311 has 2 divisors, whose sum is σ = 1021211312. Its totient is φ = 1021211310.

The previous prime is 1021211291. The next prime is 1021211341. The reversal of 1021211311 is 1131121201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021211311 - 2¹³ = 1021203119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021211291 and 1021211300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021211341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510605655 + 510605656.

It is an arithmetic number, because the mean of its divisors is an integer number (510605656).

Almost surely, 2^1021211311 is an apocalyptic number.

1021211311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021211311 is an equidigital number, since it uses as much as digits as its factorization.

1021211311 is an evil number, because the sum of its binary digits is even.

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

The square root of 1021211311 is about 31956.3970278253. The cubic root of 1021211311 is about 1007.0210268157.

Adding to 1021211311 its reverse (1131121201), we get a palindrome (2152332512).

The spelling of 1021211311 in words is "one billion, twenty-one million, two hundred eleven thousand, three hundred eleven".