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1242124321 is a prime number
BaseRepresentation
bin100101000001001…
…0101000000100001
310012120021110020111
41022002111000201
510020440434241
6323131011321
742531611464
oct11202250041
93176243214
101242124321
11588168429
122a7b99b41
1316a452c09
14bad772db
15740abc81
hex4a095021

1242124321 has 2 divisors, whose sum is σ = 1242124322. Its totient is φ = 1242124320.

The previous prime is 1242124309. The next prime is 1242124327. The reversal of 1242124321 is 1234212421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1121915025 + 120209296 = 33495^2 + 10964^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242124321 - 221 = 1240027169 is a prime.

It is a super-2 number, since 2×12421243212 = 3085745657639422082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1242124292 and 1242124301.

It is not a weakly prime, because it can be changed into another prime (1242124327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621062160 + 621062161.

It is an arithmetic number, because the mean of its divisors is an integer number (621062161).

Almost surely, 21242124321 is an apocalyptic number.

It is an amenable number.

1242124321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242124321 is an equidigital number, since it uses as much as digits as its factorization.

1242124321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 22.

The square root of 1242124321 is about 35243.7841469953. The cubic root of 1242124321 is about 1074.9502254942.

Adding to 1242124321 its reverse (1234212421), we get a palindrome (2476336742).

The spelling of 1242124321 in words is "one billion, two hundred forty-two million, one hundred twenty-four thousand, three hundred twenty-one".