1031010021 has 12 divisors (see below), whose sum is σ = 1489520448. Its totient is φ = 687209064.

The previous prime is 1031009951. The next prime is 1031010041. The reversal of 1031010021 is 1200101301.

It is not a de Polignac number, because 1031010021 - 2⁹ = 1031009509 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 = 1031009985 and 1031010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031010041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72526 + ... + 85568.

It is an arithmetic number, because the mean of its divisors is an integer number (124126704).

Almost surely, 2^1031010021 is an apocalyptic number.

It is an amenable number.

1031010021 is a deficient number, since it is larger than the sum of its proper divisors (458510427).

1031010021 is a wasteful number, since it uses less digits than its factorization.

1031010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21832 (or 21829 counting only the distinct ones).

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

The square root of 1031010021 is about 32109.3447612996. The cubic root of 1031010021 is about 1010.2316303696.

Adding to 1031010021 its reverse (1200101301), we get a palindrome (2231111322).

The spelling of 1031010021 in words is "one billion, thirty-one million, ten thousand, twenty-one".