1021023144 has 40 divisors (see below), whose sum is σ = 2859812010. Its totient is φ = 340340832.

The previous prime is 1021023131. The next prime is 1021023149. The reversal of 1021023144 is 4413201201.

It can be written as a sum of positive squares in only one way, i.e., 737774244 + 283248900 = 27162^2 + 16830^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1021023149) 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 in 9 ways as a sum of consecutive naturals, for example, 787179 + ... + 788474.

Almost surely, 2^1021023144 is an apocalyptic number.

It is an amenable number.

1021023144 is an abundant number, since it is smaller than the sum of its proper divisors (1838788866).

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

1021023144 is a wasteful number, since it uses less digits than its factorization.

1021023144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575671 (or 1575658 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1021023144 is about 31953.4527711795. The cubic root of 1021023144 is about 1006.9591722439.

Adding to 1021023144 its reverse (4413201201), we get a palindrome (5434224345).

The spelling of 1021023144 in words is "one billion, twenty-one million, twenty-three thousand, one hundred forty-four".