210010001221 has 4 divisors (see below), whose sum is σ = 221063159200. Its totient is φ = 198956843244.

The previous prime is 210010001213. The next prime is 210010001233. The reversal of 210010001221 is 122100010012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210010001221 - 2³ = 210010001213 is a prime.

It is a super-2 number, since 2×210010001221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210010001198 and 210010001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210010001251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5526578961 + ... + 5526578998.

It is an arithmetic number, because the mean of its divisors is an integer number (55265789800).

Almost surely, 2^210010001221 is an apocalyptic number.

It is an amenable number.

210010001221 is a deficient number, since it is larger than the sum of its proper divisors (11053157979).

210010001221 is a wasteful number, since it uses less digits than its factorization.

210010001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11053157978.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 210010001221 its reverse (122100010012), we get a palindrome (332110011233).

The spelling of 210010001221 in words is "two hundred ten billion, ten million, one thousand, two hundred twenty-one".