20021210110121 has 8 divisors (see below), whose sum is σ = 21841425820704. Its totient is φ = 18201012016320.

The previous prime is 20021210110061. The next prime is 20021210110123. The reversal of 20021210110121 is 12101101212002.

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 20021210110121 - 2²² = 20021205915817 is a prime.

It is a super-2 number, since 2×20021210110121² (a number of 27 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 = 20021210110096 and 20021210110105.

It is not an unprimeable number, because it can be changed into a prime (20021210110123) 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, 1969376 + ... + 6627281.

It is an arithmetic number, because the mean of its divisors is an integer number (2730178227588).

Almost surely, 2^{20021210110121} is an apocalyptic number.

It is an amenable number.

20021210110121 is a deficient number, since it is larger than the sum of its proper divisors (1820215710583).

20021210110121 is a wasteful number, since it uses less digits than its factorization.

20021210110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8808391.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20021210110121 its reverse (12101101212002), we get a palindrome (32122311322123).

It can be divided in two parts, 2002 and 1210110121, that multiplied together give a palindrome (2422640462242).

The spelling of 20021210110121 in words is "twenty trillion, twenty-one billion, two hundred ten million, one hundred ten thousand, one hundred twenty-one".