1021722065 has 16 divisors (see below), whose sum is σ = 1509005568. Its totient is φ = 646716096.

The previous prime is 1021722059. The next prime is 1021722067. The reversal of 1021722065 is 5602271201.

It is not a de Polignac number, because 1021722065 - 2⁸ = 1021721809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021722067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1122317 + ... + 1123226.

It is an arithmetic number, because the mean of its divisors is an integer number (94312848).

Almost surely, 2^1021722065 is an apocalyptic number.

It is an amenable number.

1021722065 is a deficient number, since it is larger than the sum of its proper divisors (487283503).

1021722065 is a wasteful number, since it uses less digits than its factorization.

1021722065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245568.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 1021722065 is about 31964.3874491597. The cubic root of 1021722065 is about 1007.1888844333.

Adding to 1021722065 its reverse (5602271201), we get a palindrome (6623993266).

The spelling of 1021722065 in words is "one billion, twenty-one million, seven hundred twenty-two thousand, sixty-five".