20217300621 has 8 divisors (see below), whose sum is σ = 30807315264. Its totient is φ = 11552743200.

The previous prime is 20217300601. The next prime is 20217300689. The reversal of 20217300621 is 12600371202.

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

It is not a de Polignac number, because 20217300621 - 2¹⁵ = 20217267853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20217300591 and 20217300600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20217300601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481364280 + ... + 481364321.

It is an arithmetic number, because the mean of its divisors is an integer number (3850914408).

Almost surely, 2^20217300621 is an apocalyptic number.

20217300621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20217300621 is a deficient number, since it is larger than the sum of its proper divisors (10590014643).

20217300621 is an equidigital number, since it uses as much as digits as its factorization.

20217300621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962728611.

The product of its (nonzero) digits is 1008, while the sum is 24.

Adding to 20217300621 its reverse (12600371202), we get a palindrome (32817671823).

The spelling of 20217300621 in words is "twenty billion, two hundred seventeen million, three hundred thousand, six hundred twenty-one".