51012121 has 8 divisors (see below), whose sum is σ = 54254880. Its totient is φ = 47796288.

The previous prime is 51012119. The next prime is 51012127. The reversal of 51012121 is 12121015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51012121 - 2¹ = 51012119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51012127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2751 + ... + 10468.

It is an arithmetic number, because the mean of its divisors is an integer number (6781860).

Almost surely, 2^51012121 is an apocalyptic number.

It is an amenable number.

51012121 is a deficient number, since it is larger than the sum of its proper divisors (3242759).

51012121 is a wasteful number, since it uses less digits than its factorization.

51012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13463.

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

The square root of 51012121 is about 7142.2770178704. The cubic root of 51012121 is about 370.8723536042.

Adding to 51012121 its reverse (12121015), we get a palindrome (63133136).

It can be divided in two parts, 5 and 1012121, that multiplied together give a palindrome (5060605).

The spelling of 51012121 in words is "fifty-one million, twelve thousand, one hundred twenty-one".