1000213021 has 4 divisors (see below), whose sum is σ = 1002042112. Its totient is φ = 998383932.

The previous prime is 1000213001. The next prime is 1000213087. The reversal of 1000213021 is 1203120001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1000213021 - 2⁵ = 1000212989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000212989 and 1000213007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000213001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 913725 + ... + 914818.

It is an arithmetic number, because the mean of its divisors is an integer number (250510528).

Almost surely, 2^1000213021 is an apocalyptic number.

It is an amenable number.

1000213021 is a deficient number, since it is larger than the sum of its proper divisors (1829091).

1000213021 is an equidigital number, since it uses as much as digits as its factorization.

1000213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829090.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1000213021 is about 31626.1445800780. The cubic root of 1000213021 is about 1000.0710019586.

Adding to 1000213021 its reverse (1203120001), we get a palindrome (2203333022).

The spelling of 1000213021 in words is "one billion, two hundred thirteen thousand, twenty-one".