1155232021 has 2 divisors, whose sum is σ = 1155232022. Its totient is φ = 1155232020.

The previous prime is 1155232009. The next prime is 1155232033. The reversal of 1155232021 is 1202325511.

It is a balanced prime because it is at equal distance from previous prime (1155232009) and next prime (1155232033).

It can be written as a sum of positive squares in only one way, i.e., 800324100 + 354907921 = 28290^2 + 18839^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155232021 - 2⁹ = 1155231509 is a prime.

It is a super-2 number, since 2×1155232021² = 2669122044687488882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1155231983 and 1155232001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155232061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577616010 + 577616011.

It is an arithmetic number, because the mean of its divisors is an integer number (577616011).

Almost surely, 2^1155232021 is an apocalyptic number.

It is an amenable number.

1155232021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155232021 is an equidigital number, since it uses as much as digits as its factorization.

1155232021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1155232021 is about 33988.7043148161. The cubic root of 1155232021 is about 1049.2760000682.

Adding to 1155232021 its reverse (1202325511), we get a palindrome (2357557532).

The spelling of 1155232021 in words is "one billion, one hundred fifty-five million, two hundred thirty-two thousand, twenty-one".