51124761421999 has 4 divisors (see below), whose sum is σ = 51126283886760. Its totient is φ = 51123238957240.

The previous prime is 51124761421969. The next prime is 51124761422029. The reversal of 51124761421999 is 99912416742115.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (51124761421969) and next prime (51124761422029).

It is a cyclic number.

It is not a de Polignac number, because 51124761421999 - 2¹¹ = 51124761419951 is a prime.

It is a super-2 number, since 2×51124761421999² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51124761421919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761182009 + ... + 761249170.

It is an arithmetic number, because the mean of its divisors is an integer number (12781570971690).

Almost surely, 2^{51124761421999} is an apocalyptic number.

51124761421999 is a deficient number, since it is larger than the sum of its proper divisors (1522464761).

51124761421999 is a wasteful number, since it uses less digits than its factorization.

51124761421999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522464760.

The product of its digits is 9797760, while the sum is 61.

The spelling of 51124761421999 in words is "fifty-one trillion, one hundred twenty-four billion, seven hundred sixty-one million, four hundred twenty-one thousand, nine hundred ninety-nine".