1210123021 has 2 divisors, whose sum is σ = 1210123022. Its totient is φ = 1210123020.

The previous prime is 1210123007. The next prime is 1210123039. The reversal of 1210123021 is 1203210121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1187560521 + 22562500 = 34461^2 + 4750^2 .

It is an emirp because it is prime and its reverse (1203210121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1210123021 - 2¹⁵ = 1210090253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210122992 and 1210123010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210123051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605061510 + 605061511.

It is an arithmetic number, because the mean of its divisors is an integer number (605061511).

Almost surely, 2^1210123021 is an apocalyptic number.

It is an amenable number.

1210123021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210123021 is an equidigital number, since it uses as much as digits as its factorization.

1210123021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1210123021 is about 34786.8225194541. The cubic root of 1210123021 is about 1065.6383488907.

Adding to 1210123021 its reverse (1203210121), we get a palindrome (2413333142).

The spelling of 1210123021 in words is "one billion, two hundred ten million, one hundred twenty-three thousand, twenty-one".