1010020221 has 24 divisors (see below), whose sum is σ = 1755091520. Its totient is φ = 546777216.

The previous prime is 1010020213. The next prime is 1010020223. The reversal of 1010020221 is 1220200101.

It is not a de Polignac number, because 1010020221 - 2³ = 1010020213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010020223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 420700 + ... + 423093.

Almost surely, 2^1010020221 is an apocalyptic number.

It is an amenable number.

1010020221 is a deficient number, since it is larger than the sum of its proper divisors (745071299).

1010020221 is a wasteful number, since it uses less digits than its factorization.

1010020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843825 (or 843822 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1010020221 is about 31780.8152979120. The cubic root of 1010020221 is about 1003.3289792663.

Adding to 1010020221 its reverse (1220200101), we get a palindrome (2230220322).

The spelling of 1010020221 in words is "one billion, ten million, twenty thousand, two hundred twenty-one".