1040021000 has 32 divisors (see below), whose sum is σ = 2433651480. Its totient is φ = 416008000.

The previous prime is 1040020987. The next prime is 1040021023. The reversal of 1040021000 is 1200401.

It can be written as a sum of positive squares in 4 ways, for example, as 194490916 + 845530084 = 13946^2 + 29078^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519011 + ... + 521010.

Almost surely, 2^1040021000 is an apocalyptic number.

1040021000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1040021000 is an abundant number, since it is smaller than the sum of its proper divisors (1393630480).

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

1040021000 is a wasteful number, since it uses less digits than its factorization.

1040021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040042 (or 1040028 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1040021000 is about 32249.3565827289. The cubic root of 1040021000 is about 1013.1662231164.

Adding to 1040021000 its reverse (1200401), we get a palindrome (1041221401).

The spelling of 1040021000 in words is "one billion, forty million, twenty-one thousand".