1020015221 has 8 divisors (see below), whose sum is σ = 1044204000. Its totient is φ = 996067440.

The previous prime is 1020015167. The next prime is 1020015233. The reversal of 1020015221 is 1225100201.

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-1020015221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020015196 and 1020015205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020015251) 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, 51671 + ... + 68628.

It is an arithmetic number, because the mean of its divisors is an integer number (130525500).

Almost surely, 2^1020015221 is an apocalyptic number.

It is an amenable number.

1020015221 is a deficient number, since it is larger than the sum of its proper divisors (24188779).

1020015221 is a wasteful number, since it uses less digits than its factorization.

1020015221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120499.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1020015221 is about 31937.6771384520. The cubic root of 1020015221 is about 1006.6277166608.

Adding to 1020015221 its reverse (1225100201), we get a palindrome (2245115422).

The spelling of 1020015221 in words is "one billion, twenty million, fifteen thousand, two hundred twenty-one".