220721630 has 8 divisors (see below), whose sum is σ = 397298952. Its totient is φ = 88288648.

The previous prime is 220721617. The next prime is 220721681. The reversal of 220721630 is 36127022.

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 = 220721596 and 220721605.

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, 11036072 + ... + 11036091.

It is an arithmetic number, because the mean of its divisors is an integer number (49662369).

Almost surely, 2^220721630 is an apocalyptic number.

220721630 is a deficient number, since it is larger than the sum of its proper divisors (176577322).

220721630 is a wasteful number, since it uses less digits than its factorization.

220721630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22072170.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 220721630 is about 14856.7032009124. The cubic root of 220721630 is about 604.3404053857.

Adding to 220721630 its reverse (36127022), we get a palindrome (256848652).

The spelling of 220721630 in words is "two hundred twenty million, seven hundred twenty-one thousand, six hundred thirty".