213011220021 has 4 divisors (see below), whose sum is σ = 284014960032. Its totient is φ = 142007480012.

The previous prime is 213011220013. The next prime is 213011220091. The reversal of 213011220021 is 120022110312.

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 213011220021 - 2³ = 213011220013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213011220091) 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, 35501870001 + ... + 35501870006.

It is an arithmetic number, because the mean of its divisors is an integer number (71003740008).

Almost surely, 2^213011220021 is an apocalyptic number.

It is an amenable number.

213011220021 is a deficient number, since it is larger than the sum of its proper divisors (71003740011).

213011220021 is an equidigital number, since it uses as much as digits as its factorization.

213011220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71003740010.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 213011220021 its reverse (120022110312), we get a palindrome (333033330333).

The spelling of 213011220021 in words is "two hundred thirteen billion, eleven million, two hundred twenty thousand, twenty-one".