1210418021 has 2 divisors, whose sum is σ = 1210418022. Its totient is φ = 1210418020.

The previous prime is 1210418017. The next prime is 1210418023. The reversal of 1210418021 is 1208140121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 890365921 + 320052100 = 29839^2 + 17890^2 .

It is an emirp because it is prime and its reverse (1208140121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1210418021 - 2² = 1210418017 is a prime.

It is a super-2 number, since 2×1210418021² = 2930223571123112882, which contains 22 as substring.

Together with 1210418023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210417984 and 1210418002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210418023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605209010 + 605209011.

It is an arithmetic number, because the mean of its divisors is an integer number (605209011).

Almost surely, 2^1210418021 is an apocalyptic number.

It is an amenable number.

1210418021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210418021 is an equidigital number, since it uses as much as digits as its factorization.

1210418021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 1210418021 is about 34791.0623723967. The cubic root of 1210418021 is about 1065.7249345149.

Adding to 1210418021 its reverse (1208140121), we get a palindrome (2418558142).

The spelling of 1210418021 in words is "one billion, two hundred ten million, four hundred eighteen thousand, twenty-one".