213023020021 has 8 divisors (see below), whose sum is σ = 243613909184. Its totient is φ = 182471888160.

The previous prime is 213023019983. The next prime is 213023020033. The reversal of 213023020021 is 120020320312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213023020021 - 2¹⁹ = 213022495733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213023019977 and 213023020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213023020061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9927840 + ... + 9949273.

It is an arithmetic number, because the mean of its divisors is an integer number (30451738648).

Almost surely, 2^213023020021 is an apocalyptic number.

It is an amenable number.

213023020021 is a deficient number, since it is larger than the sum of its proper divisors (30590889163).

213023020021 is a wasteful number, since it uses less digits than its factorization.

213023020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19878651.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 213023020021 its reverse (120020320312), we get a palindrome (333043340333).

The spelling of 213023020021 in words is "two hundred thirteen billion, twenty-three million, twenty thousand, twenty-one".