20210221210101 has 16 divisors (see below), whose sum is σ = 29082754525440. Its totient is φ = 12410080758720.

The previous prime is 20210221209973. The next prime is 20210221210147. The reversal of 20210221210101 is 10101212201202.

It is not a de Polignac number, because 20210221210101 - 2⁷ = 20210221209973 is a prime.

It is a super-2 number, since 2×20210221210101² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210221210171) 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, 562032781 + ... + 562068738.

It is an arithmetic number, because the mean of its divisors is an integer number (1817672157840).

Almost surely, 2^{20210221210101} is an apocalyptic number.

It is an amenable number.

20210221210101 is a deficient number, since it is larger than the sum of its proper divisors (8872533315339).

20210221210101 is a wasteful number, since it uses less digits than its factorization.

20210221210101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124101996.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20210221210101 its reverse (10101212201202), we get a palindrome (30311433411303).

The spelling of 20210221210101 in words is "twenty trillion, two hundred ten billion, two hundred twenty-one million, two hundred ten thousand, one hundred one".