210021212212021 has 64 divisors (see below), whose sum is σ = 266376630435840. Its totient is φ = 161518344192000.

The previous prime is 210021212211989. The next prime is 210021212212039. The reversal of 210021212212021 is 120212212120012.

It is a cyclic number.

It is not a de Polignac number, because 210021212212021 - 2⁵ = 210021212211989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210021212212021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021212212921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3193671781 + ... + 3193737541.

It is an arithmetic number, because the mean of its divisors is an integer number (4162134850560).

Almost surely, 2^{210021212212021} is an apocalyptic number.

It is an amenable number.

210021212212021 is a deficient number, since it is larger than the sum of its proper divisors (56355418223819).

210021212212021 is a wasteful number, since it uses less digits than its factorization.

210021212212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82346.

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

Adding to 210021212212021 its reverse (120212212120012), we get a palindrome (330233424332033).

The spelling of 210021212212021 in words is "two hundred ten trillion, twenty-one billion, two hundred twelve million, two hundred twelve thousand, twenty-one".