1021023138 has 16 divisors (see below), whose sum is σ = 2061873216. Its totient is φ = 337036560.

The previous prime is 1021023131. The next prime is 1021023149. The reversal of 1021023138 is 8313201201.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1021023131) 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 7 ways as a sum of consecutive naturals, for example, 825453 + ... + 826688.

It is an arithmetic number, because the mean of its divisors is an integer number (128867076).

Almost surely, 2^1021023138 is an apocalyptic number.

1021023138 is an abundant number, since it is smaller than the sum of its proper divisors (1040850078).

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

1021023138 is a wasteful number, since it uses less digits than its factorization.

1021023138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652249.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1021023138 is about 31953.4526772930. The cubic root of 1021023138 is about 1006.9591702715.

Adding to 1021023138 its reverse (8313201201), we get a palindrome (9334224339).

The spelling of 1021023138 in words is "one billion, twenty-one million, twenty-three thousand, one hundred thirty-eight".