20021102220121 has 4 divisors (see below), whose sum is σ = 20021240110500. Its totient is φ = 20020964329744.

The previous prime is 20021102220107. The next prime is 20021102220173. The reversal of 20021102220121 is 12102220112002.

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 1886612131600 + 18134490088521 = 1373540^2 + 4258461^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021102220121 - 2¹⁷ = 20021102089049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021102220095 and 20021102220104.

It is not an unprimeable number, because it can be changed into a prime (20021102220101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68727166 + ... + 69017863.

It is an arithmetic number, because the mean of its divisors is an integer number (5005310027625).

Almost surely, 2^{20021102220121} is an apocalyptic number.

It is an amenable number.

20021102220121 is a deficient number, since it is larger than the sum of its proper divisors (137890379).

20021102220121 is a wasteful number, since it uses less digits than its factorization.

20021102220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137890378.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20021102220121 its reverse (12102220112002), we get a palindrome (32123322332123).

The spelling of 20021102220121 in words is "twenty trillion, twenty-one billion, one hundred two million, two hundred twenty thousand, one hundred twenty-one".