102200020120021 has 4 divisors (see below), whose sum is σ = 108211786009452. Its totient is φ = 96188254230592.

The previous prime is 102200020119959. The next prime is 102200020120061. The reversal of 102200020120021 is 120021020002201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37572167788996 + 64627852331025 = 6129614^2 + 8039145^2 .

It is a cyclic number.

It is not a de Polignac number, because 102200020120021 - 2³¹ = 102197872636373 is a prime.

It is a super-2 number, since 2×102200020120021² (a number of 29 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 = 102200020119983 and 102200020120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102200020120061) 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, 3005882944690 + ... + 3005882944723.

It is an arithmetic number, because the mean of its divisors is an integer number (27052946502363).

Almost surely, 2^{102200020120021} is an apocalyptic number.

It is an amenable number.

102200020120021 is a deficient number, since it is larger than the sum of its proper divisors (6011765889431).

102200020120021 is an equidigital number, since it uses as much as digits as its factorization.

102200020120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6011765889430.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 102200020120021 its reverse (120021020002201), we get a palindrome (222221040122222).

The spelling of 102200020120021 in words is "one hundred two trillion, two hundred billion, twenty million, one hundred twenty thousand, twenty-one".