1020423221 has 8 divisors (see below), whose sum is σ = 1065200064. Its totient is φ = 975680640.

The previous prime is 1020423197. The next prime is 1020423241. The reversal of 1020423221 is 1223240201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020423221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1020423221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020423241) 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, 66341 + ... + 80261.

It is an arithmetic number, because the mean of its divisors is an integer number (133150008).

Almost surely, 2^1020423221 is an apocalyptic number.

It is an amenable number.

1020423221 is a deficient number, since it is larger than the sum of its proper divisors (44776843).

1020423221 is a wasteful number, since it uses less digits than its factorization.

1020423221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17131.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1020423221 is about 31944.0639399560. The cubic root of 1020423221 is about 1006.7619137957.

Adding to 1020423221 its reverse (1223240201), we get a palindrome (2243663422).

The spelling of 1020423221 in words is "one billion, twenty million, four hundred twenty-three thousand, two hundred twenty-one".