51111212242 has 8 divisors (see below), whose sum is σ = 79139941632. Its totient is φ = 24731231700.

The previous prime is 51111212233. The next prime is 51111212261. The reversal of 51111212242 is 24221211115.

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

It is a super-2 number, since 2×51111212242² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412187134 + ... + 412187257.

It is an arithmetic number, because the mean of its divisors is an integer number (9892492704).

Almost surely, 2^51111212242 is an apocalyptic number.

51111212242 is a deficient number, since it is larger than the sum of its proper divisors (28028729390).

51111212242 is a wasteful number, since it uses less digits than its factorization.

51111212242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824374424.

The product of its digits is 320, while the sum is 22.

Adding to 51111212242 its reverse (24221211115), we get a palindrome (75332423357).

The spelling of 51111212242 in words is "fifty-one billion, one hundred eleven million, two hundred twelve thousand, two hundred forty-two".