1021123240 has 16 divisors (see below), whose sum is σ = 2297527380. Its totient is φ = 408449280.

The previous prime is 1021123211. The next prime is 1021123333. The reversal of 1021123240 is 423211201.

It can be written as a sum of positive squares in 2 ways, for example, as 986336836 + 34786404 = 31406^2 + 5898^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12764001 + ... + 12764080.

Almost surely, 2^1021123240 is an apocalyptic number.

1021123240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021123240 is an abundant number, since it is smaller than the sum of its proper divisors (1276404140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021123240 is a wasteful number, since it uses less digits than its factorization.

1021123240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25528092 (or 25528088 counting only the distinct ones).

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

The square root of 1021123240 is about 31955.0190111037. The cubic root of 1021123240 is about 1006.9920769149.

Adding to 1021123240 its reverse (423211201), we get a palindrome (1444334441).

The spelling of 1021123240 in words is "one billion, twenty-one million, one hundred twenty-three thousand, two hundred forty".