1021071493 has 16 divisors (see below), whose sum is σ = 1165736880. Its totient is φ = 885989376.

The previous prime is 1021071487. The next prime is 1021071511. The reversal of 1021071493 is 3941701201.

It can be written as a sum of positive squares in 8 ways, for example, as 10975969 + 1010095524 = 3313^2 + 31782^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021071493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021075493) 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, 213553 + ... + 218281.

It is an arithmetic number, because the mean of its divisors is an integer number (72858555).

Almost surely, 2^1021071493 is an apocalyptic number.

1021071493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1021071493 is a deficient number, since it is larger than the sum of its proper divisors (144665387).

1021071493 is a wasteful number, since it uses less digits than its factorization.

1021071493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5736.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1021071493 is about 31954.2093158319. The cubic root of 1021071493 is about 1006.9750663337.

Adding to 1021071493 its reverse (3941701201), we get a palindrome (4962772694).

The spelling of 1021071493 in words is "one billion, twenty-one million, seventy-one thousand, four hundred ninety-three".