1021240221 has 8 divisors (see below), whose sum is σ = 1362297600. Its totient is φ = 680504832.

The previous prime is 1021240193. The next prime is 1021240247. The reversal of 1021240221 is 1220421201.

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

It is not a de Polignac number, because 1021240221 - 2¹¹ = 1021238173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021240221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021240261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72996 + ... + 85853.

It is an arithmetic number, because the mean of its divisors is an integer number (170287200).

Almost surely, 2^1021240221 is an apocalyptic number.

It is an amenable number.

1021240221 is a deficient number, since it is larger than the sum of its proper divisors (341057379).

1021240221 is a wasteful number, since it uses less digits than its factorization.

1021240221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160995.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1021240221 is about 31956.8493597226. The cubic root of 1021240221 is about 1007.0305294860.

Adding to 1021240221 its reverse (1220421201), we get a palindrome (2241661422).

The spelling of 1021240221 in words is "one billion, twenty-one million, two hundred forty thousand, two hundred twenty-one".