220210102100021 has 4 divisors (see below), whose sum is σ = 240229202290944. Its totient is φ = 200191001909100.

The previous prime is 220210102099969. The next prime is 220210102100039. The reversal of 220210102100021 is 120001201012022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220210102100021 - 2²⁶ = 220210034991157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220210102099969 and 220210102100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220210102106021) 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, 10009550095445 + ... + 10009550095466.

It is an arithmetic number, because the mean of its divisors is an integer number (60057300572736).

Almost surely, 2^{220210102100021} is an apocalyptic number.

It is an amenable number.

220210102100021 is a deficient number, since it is larger than the sum of its proper divisors (20019100190923).

220210102100021 is a wasteful number, since it uses less digits than its factorization.

220210102100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20019100190922.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 220210102100021 its reverse (120001201012022), we get a palindrome (340211303112043).

The spelling of 220210102100021 in words is "two hundred twenty trillion, two hundred ten billion, one hundred two million, one hundred thousand, twenty-one".