21210021212122 has 16 divisors (see below), whose sum is σ = 32416935651072. Its totient is φ = 10404395997840.

The previous prime is 21210021212089. The next prime is 21210021212123. The reversal of 21210021212122 is 22121212001212.

It is a self number, because there is not a number n which added to its sum of digits gives 21210021212122.

It is not an unprimeable number, because it can be changed into a prime (21210021212123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2865654 + ... + 7115617.

It is an arithmetic number, because the mean of its divisors is an integer number (2026058478192).

Almost surely, 2^{21210021212122} is an apocalyptic number.

21210021212122 is a deficient number, since it is larger than the sum of its proper divisors (11206914438950).

21210021212122 is a wasteful number, since it uses less digits than its factorization.

21210021212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10001373.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21210021212122 its reverse (22121212001212), we get a palindrome (43331233213334).

The spelling of 21210021212122 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, two hundred twelve thousand, one hundred twenty-two".