220031205621 has 8 divisors (see below), whose sum is σ = 293381663040. Its totient is φ = 146684109312.

The previous prime is 220031205587. The next prime is 220031205661. The reversal of 220031205621 is 126502130022.

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

It is not a de Polignac number, because 220031205621 - 2¹⁰ = 220031204597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220031205591 and 220031205600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220031205661) 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, 683340 + ... + 952373.

It is an arithmetic number, because the mean of its divisors is an integer number (36672707880).

Almost surely, 2^220031205621 is an apocalyptic number.

It is an amenable number.

220031205621 is a deficient number, since it is larger than the sum of its proper divisors (73350457419).

220031205621 is a wasteful number, since it uses less digits than its factorization.

220031205621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680555.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 220031205621 its reverse (126502130022), we get a palindrome (346533335643).

The spelling of 220031205621 in words is "two hundred twenty billion, thirty-one million, two hundred five thousand, six hundred twenty-one".