1046721021 has 24 divisors (see below), whose sum is σ = 1454124672. Its totient is φ = 669340800.

The previous prime is 1046721019. The next prime is 1046721023. The reversal of 1046721021 is 1201276401.

It is an interprime number because it is at equal distance from previous prime (1046721019) and next prime (1046721023).

It is not a de Polignac number, because 1046721021 - 2¹ = 1046721019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1046720982 and 1046721000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1046721023) 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, 456540 + ... + 458826.

It is an arithmetic number, because the mean of its divisors is an integer number (60588528).

Almost surely, 2^1046721021 is an apocalyptic number.

It is an amenable number.

1046721021 is a deficient number, since it is larger than the sum of its proper divisors (407403651).

1046721021 is an equidigital number, since it uses as much as digits as its factorization.

1046721021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2453 (or 2392 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 1046721021 is about 32353.0681852587. The cubic root of 1046721021 is about 1015.3372401340.

Adding to 1046721021 its reverse (1201276401), we get a palindrome (2247997422).

The spelling of 1046721021 in words is "one billion, forty-six million, seven hundred twenty-one thousand, twenty-one".