21020100020122 has 16 divisors (see below), whose sum is σ = 36094614883200. Its totient is φ = 8993574867888.

The previous prime is 21020100020081. The next prime is 21020100020147. The reversal of 21020100020122 is 22102000102012.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1253276853 + ... + 1253293624.

It is an arithmetic number, because the mean of its divisors is an integer number (2255913430200).

Almost surely, 2^{21020100020122} is an apocalyptic number.

21020100020122 is a deficient number, since it is larger than the sum of its proper divisors (15074514863078).

21020100020122 is a wasteful number, since it uses less digits than its factorization.

21020100020122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506571085.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21020100020122 its reverse (22102000102012), we get a palindrome (43122100122134).

The spelling of 21020100020122 in words is "twenty-one trillion, twenty billion, one hundred million, twenty thousand, one hundred twenty-two".