102220220021 has 4 divisors (see below), whose sum is σ = 103124823852. Its totient is φ = 101315616192.

The previous prime is 102220219999. The next prime is 102220220083. The reversal of 102220220021 is 120022022201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120022022201 = 17 ⋅7060118953.

It can be written as a sum of positive squares in 2 ways, for example, as 960070225 + 101260149796 = 30985^2 + 318214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102220220021 is a prime.

It is a super-2 number, since 2×102220220021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102220219978 and 102220220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102220220621) 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, 452301746 + ... + 452301971.

It is an arithmetic number, because the mean of its divisors is an integer number (25781205963).

Almost surely, 2^102220220021 is an apocalyptic number.

It is an amenable number.

102220220021 is a deficient number, since it is larger than the sum of its proper divisors (904603831).

102220220021 is an equidigital number, since it uses as much as digits as its factorization.

102220220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904603830.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 102220220021 its reverse (120022022201), we get a palindrome (222242242222).

The spelling of 102220220021 in words is "one hundred two billion, two hundred twenty million, two hundred twenty thousand, twenty-one".