210210011001221 has 32 divisors (see below), whose sum is σ = 262614899927808. Its totient is φ = 163465848944640.

The previous prime is 210210011001167. The next prime is 210210011001223. The reversal of 210210011001221 is 122100110012012.

210210011001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 210210011001221 - 2⁶ = 210210011001157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210210011001196 and 210210011001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210210011001223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174945941 + ... + 176143413.

It is an arithmetic number, because the mean of its divisors is an integer number (8206715622744).

Almost surely, 2^{210210011001221} is an apocalyptic number.

It is an amenable number.

210210011001221 is a deficient number, since it is larger than the sum of its proper divisors (52404888926587).

210210011001221 is a wasteful number, since it uses less digits than its factorization.

210210011001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202141.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210210011001221 its reverse (122100110012012), we get a palindrome (332310121013233).

The spelling of 210210011001221 in words is "two hundred ten trillion, two hundred ten billion, eleven million, one thousand, two hundred twenty-one".