1010221221 has 4 divisors (see below), whose sum is σ = 1346961632. Its totient is φ = 673480812.

The previous prime is 1010221189. The next prime is 1010221229. The reversal of 1010221221 is 1221220101.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1221220101 = 3 ⋅407073367.

It is not a de Polignac number, because 1010221221 - 2⁵ = 1010221189 is a prime.

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 = 1010221197 and 1010221206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010221229) 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, 168370201 + ... + 168370206.

It is an arithmetic number, because the mean of its divisors is an integer number (336740408).

Almost surely, 2^1010221221 is an apocalyptic number.

It is an amenable number.

1010221221 is a deficient number, since it is larger than the sum of its proper divisors (336740411).

1010221221 is an equidigital number, since it uses as much as digits as its factorization.

1010221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336740410.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1010221221 is about 31783.9774257408. The cubic root of 1010221221 is about 1003.3955309862.

Adding to 1010221221 its reverse (1221220101), we get a palindrome (2231441322).

The spelling of 1010221221 in words is "one billion, ten million, two hundred twenty-one thousand, two hundred twenty-one".