21010100220121 has 16 divisors (see below), whose sum is σ = 22043930510848. Its totient is φ = 19998541785600.

The previous prime is 21010100220089. The next prime is 21010100220163. The reversal of 21010100220121 is 12102200101012.

It is a cyclic number.

It is not a de Polignac number, because 21010100220121 - 2⁵ = 21010100220089 is a prime.

It is a super-2 number, since 2×21010100220121² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21010170220121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92653546 + ... + 92880028.

It is an arithmetic number, because the mean of its divisors is an integer number (1377745656928).

Almost surely, 2^{21010100220121} is an apocalyptic number.

It is an amenable number.

21010100220121 is a deficient number, since it is larger than the sum of its proper divisors (1033830290727).

21010100220121 is a wasteful number, since it uses less digits than its factorization.

21010100220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275632.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21010100220121 its reverse (12102200101012), we get a palindrome (33112300321133).

The spelling of 21010100220121 in words is "twenty-one trillion, ten billion, one hundred million, two hundred twenty thousand, one hundred twenty-one".