51621322 has 8 divisors (see below), whose sum is σ = 79079616. Its totient is φ = 25261452.

The previous prime is 51621319. The next prime is 51621329. The reversal of 51621322 is 22312615.

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

It is a junction number, because it is equal to n+sod(n) for n = 51621293 and 51621302.

It is not an unprimeable number, because it can be changed into a prime (51621329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274488 + ... + 274675.

It is an arithmetic number, because the mean of its divisors is an integer number (9884952).

Almost surely, 2^51621322 is an apocalyptic number.

51621322 is a deficient number, since it is larger than the sum of its proper divisors (27458294).

51621322 is a wasteful number, since it uses less digits than its factorization.

51621322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549212.

The product of its digits is 720, while the sum is 22.

The square root of 51621322 is about 7184.7979790666. The cubic root of 51621322 is about 372.3428690303.

Adding to 51621322 its reverse (22312615), we get a palindrome (73933937).

The spelling of 51621322 in words is "fifty-one million, six hundred twenty-one thousand, three hundred twenty-two".