21021012222122 has 16 divisors (see below), whose sum is σ = 35584158621600. Its totient is φ = 9225522605040.

The previous prime is 21021012222109. The next prime is 21021012222173. The reversal of 21021012222122 is 22122221012012.

It is a junction number, because it is equal to n+sod(n) for n = 21021012222094 and 21021012222103.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16474146872 + ... + 16474148147.

It is an arithmetic number, because the mean of its divisors is an integer number (2224009913850).

Almost surely, 2^{21021012222122} is an apocalyptic number.

21021012222122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21021012222122 is a deficient number, since it is larger than the sum of its proper divisors (14563146399478).

21021012222122 is a wasteful number, since it uses less digits than its factorization.

21021012222122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32948295061.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21021012222122 its reverse (22122221012012), we get a palindrome (43143233234134).

The spelling of 21021012222122 in words is "twenty-one trillion, twenty-one billion, twelve million, two hundred twenty-two thousand, one hundred twenty-two".