21022020210121 has 16 divisors (see below), whose sum is σ = 24511595068800. Its totient is φ = 17654972744448.

The previous prime is 21022020210089. The next prime is 21022020210157. The reversal of 21022020210121 is 12101202022012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21022020210121 - 2⁵ = 21022020210089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21022020210095 and 21022020210104.

It is not an unprimeable number, because it can be changed into a prime (21022020210181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38063536 + ... + 38611873.

It is an arithmetic number, because the mean of its divisors is an integer number (1531974691800).

Almost surely, 2^{21022020210121} is an apocalyptic number.

It is an amenable number.

21022020210121 is a deficient number, since it is larger than the sum of its proper divisors (3489574858679).

21022020210121 is an equidigital number, since it uses as much as digits as its factorization.

21022020210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76676208.

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

Adding to 21022020210121 its reverse (12101202022012), we get a palindrome (33123222232133).

The spelling of 21022020210121 in words is "twenty-one trillion, twenty-two billion, twenty million, two hundred ten thousand, one hundred twenty-one".