2101001221 has 8 divisors (see below), whose sum is σ = 2293784064. Its totient is φ = 1908515520.

The previous prime is 2101001207. The next prime is 2101001237. The reversal of 2101001221 is 1221001012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2101001221 - 2⁷ = 2101001093 is a prime.

It is a super-2 number, since 2×2101001221² = 8828412261286981682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2101001198 and 2101001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101001261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59365 + ... + 87898.

It is an arithmetic number, because the mean of its divisors is an integer number (286723008).

Almost surely, 2^2101001221 is an apocalyptic number.

It is an amenable number.

2101001221 is a deficient number, since it is larger than the sum of its proper divisors (192782843).

2101001221 is a wasteful number, since it uses less digits than its factorization.

2101001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148571.

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

The square root of 2101001221 is about 45836.6798644928. The cubic root of 2101001221 is about 1280.7826473753.

Adding to 2101001221 its reverse (1221001012), we get a palindrome (3322002233).

The spelling of 2101001221 in words is "two billion, one hundred one million, one thousand, two hundred twenty-one".