1021224440 has 16 divisors (see below), whose sum is σ = 2297755080. Its totient is φ = 408489760.

The previous prime is 1021224437. The next prime is 1021224469. The reversal of 1021224440 is 444221201.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12765266 + ... + 12765345.

Almost surely, 2^1021224440 is an apocalyptic number.

1021224440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021224440 is an abundant number, since it is smaller than the sum of its proper divisors (1276530640).

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

1021224440 is a wasteful number, since it uses less digits than its factorization.

1021224440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25530622 (or 25530618 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1021224440 is about 31956.6024476946. The cubic root of 1021224440 is about 1007.0253423190.

Adding to 1021224440 its reverse (444221201), we get a palindrome (1465445641).

The spelling of 1021224440 in words is "one billion, twenty-one million, two hundred twenty-four thousand, four hundred forty".