51342121 has 2 divisors, whose sum is σ = 51342122. Its totient is φ = 51342120.

The previous prime is 51342119. The next prime is 51342133. The reversal of 51342121 is 12124315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36132121 + 15210000 = 6011^2 + 3900^2 .

It is a cyclic number.

It is not a de Polignac number, because 51342121 - 2¹ = 51342119 is a prime.

Together with 51342119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51342191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25671060 + 25671061.

It is an arithmetic number, because the mean of its divisors is an integer number (25671061).

Almost surely, 2^51342121 is an apocalyptic number.

It is an amenable number.

51342121 is a deficient number, since it is larger than the sum of its proper divisors (1).

51342121 is an equidigital number, since it uses as much as digits as its factorization.

51342121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 19.

The square root of 51342121 is about 7165.3416527058. The cubic root of 51342121 is about 371.6703659692.

Adding to 51342121 its reverse (12124315), we get a palindrome (63466436).

The spelling of 51342121 in words is "fifty-one million, three hundred forty-two thousand, one hundred twenty-one".