210221112210021 has 48 divisors (see below), whose sum is σ = 331580031843840. Its totient is φ = 127282744949760.

The previous prime is 210221112210001. The next prime is 210221112210041. The reversal of 210221112210021 is 120012211122012.

210221112210021 is a `hidden beast` number, since 210 + 2 + 211 + 1 + 221 + 0 + 0 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (210221112210001) and next prime (210221112210041).

It is not a de Polignac number, because 210221112210021 - 2⁵ = 210221112209989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210221112209976 and 210221112210003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221112210001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 445797261 + ... + 446268573.

It is an arithmetic number, because the mean of its divisors is an integer number (6907917330080).

Almost surely, 2^{210221112210021} is an apocalyptic number.

It is an amenable number.

210221112210021 is a deficient number, since it is larger than the sum of its proper divisors (121358919633819).

210221112210021 is a wasteful number, since it uses less digits than its factorization.

210221112210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475706 (or 475703 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 210221112210021 its reverse (120012211122012), we get a palindrome (330233323332033).

The spelling of 210221112210021 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred twelve million, two hundred ten thousand, twenty-one".