2131221011 has 2 divisors, whose sum is σ = 2131221012. Its totient is φ = 2131221010.

The previous prime is 2131220983. The next prime is 2131221061. The reversal of 2131221011 is 1101221312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2131221011 - 2¹⁴ = 2131204627 is a prime.

It is not a weakly prime, because it can be changed into another prime (2131221061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065610505 + 1065610506.

It is an arithmetic number, because the mean of its divisors is an integer number (1065610506).

Almost surely, 2^2131221011 is an apocalyptic number.

2131221011 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131221011 is an equidigital number, since it uses as much as digits as its factorization.

2131221011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 2131221011 is about 46165.1493120081. The cubic root of 2131221011 is about 1286.8941590006.

Adding to 2131221011 its reverse (1101221312), we get a palindrome (3232442323).

The spelling of 2131221011 in words is "two billion, one hundred thirty-one million, two hundred twenty-one thousand, eleven".