1000131021 has 24 divisors (see below), whose sum is σ = 1504478976. Its totient is φ = 639515520.

The previous prime is 1000131019. The next prime is 1000131037. The reversal of 1000131021 is 1201310001.

It is not a de Polignac number, because 1000131021 - 2¹ = 1000131019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1000130994 and 1000131012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000131071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15666 + ... + 47388.

It is an arithmetic number, because the mean of its divisors is an integer number (62686624).

Almost surely, 2^1000131021 is an apocalyptic number.

It is an amenable number.

1000131021 is a deficient number, since it is larger than the sum of its proper divisors (504347955).

1000131021 is a wasteful number, since it uses less digits than its factorization.

1000131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31873 (or 31870 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1000131021 is about 31624.8481577382. The cubic root of 1000131021 is about 1000.0436717594.

Adding to 1000131021 its reverse (1201310001), we get a palindrome (2201441022).

The spelling of 1000131021 in words is "one billion, one hundred thirty-one thousand, twenty-one".