21210021020122 has 32 divisors (see below), whose sum is σ = 34821981627264. Its totient is φ = 9609070099200.

The previous prime is 21210021020077. The next prime is 21210021020173. The reversal of 21210021020122 is 22102012001212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21210021020096 and 21210021020105.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80830398 + ... + 81092374.

It is an arithmetic number, because the mean of its divisors is an integer number (1088186925852).

Almost surely, 2^{21210021020122} is an apocalyptic number.

21210021020122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21210021020122 is a deficient number, since it is larger than the sum of its proper divisors (13611960607142).

21210021020122 is a wasteful number, since it uses less digits than its factorization.

21210021020122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274134.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21210021020122 its reverse (22102012001212), we get a palindrome (43312033021334).

The spelling of 21210021020122 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, twenty thousand, one hundred twenty-two".