51225421534 has 24 divisors (see below), whose sum is σ = 92465315640. Its totient is φ = 21196724976.

The previous prime is 51225421501. The next prime is 51225421553. The reversal of 51225421534 is 43512452215.

It is a happy number.

It is a super-2 number, since 2×51225421534² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51225421534.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9009372 + ... + 9015055.

It is an arithmetic number, because the mean of its divisors is an integer number (3852721485).

Almost surely, 2^51225421534 is an apocalyptic number.

51225421534 is a deficient number, since it is larger than the sum of its proper divisors (41239894106).

51225421534 is a wasteful number, since it uses less digits than its factorization.

51225421534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18024472 (or 18024465 counting only the distinct ones).

The product of its digits is 48000, while the sum is 34.

Adding to 51225421534 its reverse (43512452215), we get a palindrome (94737873749).

The spelling of 51225421534 in words is "fifty-one billion, two hundred twenty-five million, four hundred twenty-one thousand, five hundred thirty-four".