210210001220021 has 32 divisors (see below), whose sum is σ = 250644666055680. Its totient is φ = 174055058150400.

The previous prime is 210210001220017. The next prime is 210210001220027. The reversal of 210210001220021 is 120022100012012.

It is a cyclic number.

It is not a de Polignac number, because 210210001220021 - 2² = 210210001220017 is a prime.

It is a super-2 number, since 2×210210001220021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210210001219978 and 210210001220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210210001220027) 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 31 ways as a sum of consecutive naturals, for example, 893947955 + ... + 894183071.

It is an arithmetic number, because the mean of its divisors is an integer number (7832645814240).

Almost surely, 2^{210210001220021} is an apocalyptic number.

It is an amenable number.

210210001220021 is a deficient number, since it is larger than the sum of its proper divisors (40434664835659).

210210001220021 is a wasteful number, since it uses less digits than its factorization.

210210001220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389405.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210210001220021 its reverse (120022100012012), we get a palindrome (330232101232033).

The spelling of 210210001220021 in words is "two hundred ten trillion, two hundred ten billion, one million, two hundred twenty thousand, twenty-one".