51221438 has 8 divisors (see below), whose sum is σ = 76863600. Its totient is φ = 25600240.

The previous prime is 51221419. The next prime is 51221441. The reversal of 51221438 is 83412215.

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

It is a congruent number.

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, 4463 + ... + 11061.

It is an arithmetic number, because the mean of its divisors is an integer number (9607950).

Almost surely, 2^51221438 is an apocalyptic number.

51221438 is a deficient number, since it is larger than the sum of its proper divisors (25642162).

51221438 is a wasteful number, since it uses less digits than its factorization.

51221438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10482.

The product of its digits is 1920, while the sum is 26.

The square root of 51221438 is about 7156.9153970129. The cubic root of 51221438 is about 371.3789256976.

The spelling of 51221438 in words is "fifty-one million, two hundred twenty-one thousand, four hundred thirty-eight".