1010211221 has 4 divisors (see below), whose sum is σ = 1054133472. Its totient is φ = 966288972.

The previous prime is 1010211203. The next prime is 1010211227. The reversal of 1010211221 is 1221120101.

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 not a de Polignac number, because 1010211221 - 2¹⁴ = 1010194837 is a prime.

It is a super-2 number, since 2×1010211221² = 2041053422068621682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010211227) 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, 21961091 + ... + 21961136.

It is an arithmetic number, because the mean of its divisors is an integer number (263533368).

Almost surely, 2^1010211221 is an apocalyptic number.

It is an amenable number.

1010211221 is a deficient number, since it is larger than the sum of its proper divisors (43922251).

1010211221 is an equidigital number, since it uses as much as digits as its factorization.

1010211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43922250.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1010211221 is about 31783.8201133847. The cubic root of 1010211221 is about 1003.3922201641.

Adding to 1010211221 its reverse (1221120101), we get a palindrome (2231331322).

The spelling of 1010211221 in words is "one billion, ten million, two hundred eleven thousand, two hundred twenty-one".