21010102220121 has 24 divisors (see below), whose sum is σ = 32587280832960. Its totient is φ = 12005705087712.

The previous prime is 21010102220099. The next prime is 21010102220131. The reversal of 21010102220121 is 12102220101012.

It is not a de Polignac number, because 21010102220121 - 2¹⁵ = 21010102187353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21010102220121.

It is not an unprimeable number, because it can be changed into a prime (21010102220131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38609395 + ... + 39149783.

It is an arithmetic number, because the mean of its divisors is an integer number (1357803368040).

Almost surely, 2^{21010102220121} is an apocalyptic number.

21010102220121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21010102220121 is a deficient number, since it is larger than the sum of its proper divisors (11577178612839).

21010102220121 is a wasteful number, since it uses less digits than its factorization.

21010102220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804893 (or 804886 counting only the distinct ones).

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

Adding to 21010102220121 its reverse (12102220101012), we get a palindrome (33112322321133).

The spelling of 21010102220121 in words is "twenty-one trillion, ten billion, one hundred two million, two hundred twenty thousand, one hundred twenty-one".