20210102120021 has 16 divisors (see below), whose sum is σ = 22127520959808. Its totient is φ = 18306042681600.

The previous prime is 20210102120009. The next prime is 20210102120053. The reversal of 20210102120021 is 12002120101202.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210102120021 is a prime.

It is a super-4 number, since 4×20210102120021⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a junction number, because it is equal to n+sod(n) for n = 20210102119978 and 20210102120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210102120521) 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 15 ways as a sum of consecutive naturals, for example, 247774781 + ... + 247856333.

It is an arithmetic number, because the mean of its divisors is an integer number (1382970059988).

Almost surely, 2^{20210102120021} is an apocalyptic number.

It is an amenable number.

20210102120021 is a deficient number, since it is larger than the sum of its proper divisors (1917418839787).

20210102120021 is a wasteful number, since it uses less digits than its factorization.

20210102120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163172.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20210102120021 its reverse (12002120101202), we get a palindrome (32212222221223).

The spelling of 20210102120021 in words is "twenty trillion, two hundred ten billion, one hundred two million, one hundred twenty thousand, twenty-one".