1190218021 has 2 divisors, whose sum is σ = 1190218022. Its totient is φ = 1190218020.

The previous prime is 1190218019. The next prime is 1190218063. The reversal of 1190218021 is 1208120911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 681940996 + 508277025 = 26114^2 + 22545^2 .

It is a cyclic number.

It is not a de Polignac number, because 1190218021 - 2¹ = 1190218019 is a prime.

Together with 1190218019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1190218321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595109010 + 595109011.

It is an arithmetic number, because the mean of its divisors is an integer number (595109011).

Almost surely, 2^1190218021 is an apocalyptic number.

It is an amenable number.

1190218021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1190218021 is an equidigital number, since it uses as much as digits as its factorization.

1190218021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 1190218021 is about 34499.5365331188. The cubic root of 1190218021 is about 1059.7632142870.

Adding to 1190218021 its reverse (1208120911), we get a palindrome (2398338932).

The spelling of 1190218021 in words is "one billion, one hundred ninety million, two hundred eighteen thousand, twenty-one".