1021235494 has 4 divisors (see below), whose sum is σ = 1531853244. Its totient is φ = 510617746.

The previous prime is 1021235491. The next prime is 1021235513. The reversal of 1021235494 is 4945321201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4945321201 = 1759 ⋅2811439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021235491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255308872 + ... + 255308875.

It is an arithmetic number, because the mean of its divisors is an integer number (382963311).

Almost surely, 2^1021235494 is an apocalyptic number.

1021235494 is a deficient number, since it is larger than the sum of its proper divisors (510617750).

1021235494 is an equidigital number, since it uses as much as digits as its factorization.

1021235494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510617749.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1021235494 is about 31956.7754005313. The cubic root of 1021235494 is about 1007.0289757410.

Adding to 1021235494 its reverse (4945321201), we get a palindrome (5966556695).

The spelling of 1021235494 in words is "one billion, twenty-one million, two hundred thirty-five thousand, four hundred ninety-four".