1021542004 has 18 divisors (see below), whose sum is σ = 2079568050. Its totient is φ = 437803632.

The previous prime is 1021542001. The next prime is 1021542031. The reversal of 1021542004 is 4002451201.

It can be written as a sum of positive squares in only one way, i.e., 1009968400 + 11573604 = 31780^2 + 3402^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021542001) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 2605779 + ... + 2606170.

Almost surely, 2^1021542004 is an apocalyptic number.

1021542004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1021542004 is an abundant number, since it is smaller than the sum of its proper divisors (1058026046).

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

1021542004 is a wasteful number, since it uses less digits than its factorization.

1021542004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5211967 (or 5211958 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 1021542004 is about 31961.5707373715. The cubic root of 1021542004 is about 1007.1297143652.

Adding to 1021542004 its reverse (4002451201), we get a palindrome (5023993205).

The spelling of 1021542004 in words is "one billion, twenty-one million, five hundred forty-two thousand, four".