12151021 has 2 divisors, whose sum is σ = 12151022. Its totient is φ = 12151020.

The previous prime is 12151019. The next prime is 12151031. The reversal of 12151021 is 12015121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8328996 + 3822025 = 2886^2 + 1955^2 .

It is a cyclic number.

It is not a de Polignac number, because 12151021 - 2¹ = 12151019 is a prime.

It is a super-2 number, since 2×12151021² = 295294622684882, which contains 22 as substring.

Together with 12151019, 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 = 12150992 and 12151010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12151031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6075510 + 6075511.

It is an arithmetic number, because the mean of its divisors is an integer number (6075511).

Almost surely, 2^12151021 is an apocalyptic number.

It is an amenable number.

12151021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12151021 is an equidigital number, since it uses as much as digits as its factorization.

12151021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 12151021 is about 3485.8314646580. The cubic root of 12151021 is about 229.8992690598.

Adding to 12151021 its reverse (12015121), we get a palindrome (24166142).

The spelling of 12151021 in words is "twelve million, one hundred fifty-one thousand, twenty-one".