20210102202121 has 8 divisors (see below), whose sum is σ = 21764782343304. Its totient is φ = 18655430188800.

The previous prime is 20210102202119. The next prime is 20210102202149. The reversal of 20210102202121 is 12120220101202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2866042457721 + 17344059744400 = 1692939^2 + 4164620^2 .

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 20210102202121 - 2¹ = 20210102202119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20210102202095 and 20210102202104.

It is not an unprimeable number, because it can be changed into a prime (20210102205121) 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 7 ways as a sum of consecutive naturals, for example, 3739521 + ... + 7375921.

It is an arithmetic number, because the mean of its divisors is an integer number (2720597792913).

Almost surely, 2^{20210102202121} is an apocalyptic number.

It is an amenable number.

20210102202121 is a deficient number, since it is larger than the sum of its proper divisors (1554680141183).

20210102202121 is a wasteful number, since it uses less digits than its factorization.

20210102202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4063931.

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

Adding to 20210102202121 its reverse (12120220101202), we get a palindrome (32330322303323).

The spelling of 20210102202121 in words is "twenty trillion, two hundred ten billion, one hundred two million, two hundred two thousand, one hundred twenty-one".