51221602437 has 16 divisors (see below), whose sum is σ = 71983520640. Its totient is φ = 32348144192.

The previous prime is 51221602423. The next prime is 51221602441. The reversal of 51221602437 is 73420612215.

It is not a de Polignac number, because 51221602437 - 2⁶ = 51221602373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51221602398 and 51221602407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51221602037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5549673 + ... + 5558894.

It is an arithmetic number, because the mean of its divisors is an integer number (4498970040).

Almost surely, 2^51221602437 is an apocalyptic number.

It is an amenable number.

51221602437 is a deficient number, since it is larger than the sum of its proper divisors (20761918203).

51221602437 is a wasteful number, since it uses less digits than its factorization.

51221602437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11108652.

The product of its (nonzero) digits is 20160, while the sum is 33.

The spelling of 51221602437 in words is "fifty-one billion, two hundred twenty-one million, six hundred two thousand, four hundred thirty-seven".