102220100021 has 8 divisors (see below), whose sum is σ = 110145158424. Its totient is φ = 94303895040.

The previous prime is 102220099991. The next prime is 102220100051. The reversal of 102220100021 is 120001022201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (102220099991) and next prime (102220100051).

It can be written as a sum of positive squares in 4 ways, for example, as 40780996 + 102179319025 = 6386^2 + 319655^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 102220100021 - 2¹⁰ = 102220098997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102220099975 and 102220100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102220100051) 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, 2189360 + ... + 2235561.

It is an arithmetic number, because the mean of its divisors is an integer number (13768144803).

Almost surely, 2^102220100021 is an apocalyptic number.

It is an amenable number.

102220100021 is a deficient number, since it is larger than the sum of its proper divisors (7925058403).

102220100021 is a wasteful number, since it uses less digits than its factorization.

102220100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4426711.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 102220100021 its reverse (120001022201), we get a palindrome (222221122222).

The spelling of 102220100021 in words is "one hundred two billion, two hundred twenty million, one hundred thousand, twenty-one".