51401242121 has 12 divisors (see below), whose sum is σ = 52414028940. Its totient is φ = 50407680960.

The previous prime is 51401242111. The next prime is 51401242133. The reversal of 51401242121 is 12124210415.

It can be written as a sum of positive squares in 6 ways, for example, as 2019513721 + 49381728400 = 44939^2 + 222220^2 .

It is not a de Polignac number, because 51401242121 - 2¹⁴ = 51401225737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51401242111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10730795 + ... + 10735583.

It is an arithmetic number, because the mean of its divisors is an integer number (4367835745).

Almost surely, 2^51401242121 is an apocalyptic number.

It is an amenable number.

51401242121 is a deficient number, since it is larger than the sum of its proper divisors (1012786819).

51401242121 is an equidigital number, since it uses as much as digits as its factorization.

51401242121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8716 (or 8663 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 51401242121 its reverse (12124210415), we get a palindrome (63525452536).

The spelling of 51401242121 in words is "fifty-one billion, four hundred one million, two hundred forty-two thousand, one hundred twenty-one".