21001002100122 has 32 divisors (see below), whose sum is σ = 45820548817344. Its totient is φ = 6363914947200.

The previous prime is 21001002100109. The next prime is 21001002100129. The reversal of 21001002100122 is 22100120010012.

It is a junction number, because it is equal to n+sod(n) for n = 21001002100098 and 21001002100107.

It is not an unprimeable number, because it can be changed into a prime (21001002100129) 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, 22858128 + ... + 23759124.

It is an arithmetic number, because the mean of its divisors is an integer number (1431892150542).

Almost surely, 2^{21001002100122} is an apocalyptic number.

21001002100122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21001002100122 is an abundant number, since it is smaller than the sum of its proper divisors (24819546717222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21001002100122 is a wasteful number, since it uses less digits than its factorization.

21001002100122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254174.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21001002100122 its reverse (22100120010012), we get a palindrome (43101122110134).

The spelling of 21001002100122 in words is "twenty-one trillion, one billion, two million, one hundred thousand, one hundred twenty-two".