213202120021 has 16 divisors (see below), whose sum is σ = 234107311680. Its totient is φ = 192553528320.

The previous prime is 213202120013. The next prime is 213202120049. The reversal of 213202120021 is 120021202312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 213202120021 - 2³ = 213202120013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213202119977 and 213202120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213202120321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1500951 + ... + 1636843.

It is an arithmetic number, because the mean of its divisors is an integer number (14631706980).

Almost surely, 2^213202120021 is an apocalyptic number.

It is an amenable number.

213202120021 is a deficient number, since it is larger than the sum of its proper divisors (20905191659).

213202120021 is a wasteful number, since it uses less digits than its factorization.

213202120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136836.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 213202120021 its reverse (120021202312), we get a palindrome (333223322333).

The spelling of 213202120021 in words is "two hundred thirteen billion, two hundred two million, one hundred twenty thousand, twenty-one".