1021340221 has 16 divisors (see below), whose sum is σ = 1143963648. Its totient is φ = 903890800.

The previous prime is 1021340213. The next prime is 1021340261. The reversal of 1021340221 is 1220431201.

It is a cyclic number.

It is not a de Polignac number, because 1021340221 - 2³ = 1021340213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021340195 and 1021340204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021340261) 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, 93576 + ... + 103918.

It is an arithmetic number, because the mean of its divisors is an integer number (71497728).

Almost surely, 2^1021340221 is an apocalyptic number.

1021340221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021340221 is a deficient number, since it is larger than the sum of its proper divisors (122623427).

1021340221 is a wasteful number, since it uses less digits than its factorization.

1021340221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10592.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1021340221 is about 31958.4139312326. The cubic root of 1021340221 is about 1007.0633979415.

Adding to 1021340221 its reverse (1220431201), we get a palindrome (2241771422).

The spelling of 1021340221 in words is "one billion, twenty-one million, three hundred forty thousand, two hundred twenty-one".