213220023021 has 24 divisors (see below), whose sum is σ = 310597767480. Its totient is φ = 140942992896.

The previous prime is 213220022929. The next prime is 213220023031. The reversal of 213220023021 is 120320022312.

213220023021 is a `hidden beast` number, since 213 + 2 + 200 + 230 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 41662524996 + 171557498025 = 204114^2 + 414195^2 .

It is not a de Polignac number, because 213220023021 - 2²⁶ = 213152914157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213220022985 and 213220023003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213220023031) 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, 950385 + ... + 1153113.

It is an arithmetic number, because the mean of its divisors is an integer number (12941573645).

Almost surely, 2^213220023021 is an apocalyptic number.

It is an amenable number.

213220023021 is a deficient number, since it is larger than the sum of its proper divisors (97377744459).

213220023021 is a wasteful number, since it uses less digits than its factorization.

213220023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203725 (or 203722 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 213220023021 its reverse (120320022312), we get a palindrome (333540045333).

The spelling of 213220023021 in words is "two hundred thirteen billion, two hundred twenty million, twenty-three thousand, twenty-one".