213021004122 has 24 divisors (see below), whose sum is σ = 466303713876. Its totient is φ = 70274969856.

The previous prime is 213021004111. The next prime is 213021004139. The reversal of 213021004122 is 221400120312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 209122375401 + 3898628721 = 457299^2 + 62439^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 213021004095 and 213021004104.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61000833 + ... + 61004324.

Almost surely, 2^213021004122 is an apocalyptic number.

213021004122 is an abundant number, since it is smaller than the sum of its proper divisors (253282709754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213021004122 is a wasteful number, since it uses less digits than its factorization.

213021004122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122005262 (or 122005259 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 213021004122 its reverse (221400120312), we get a palindrome (434421124434).

The spelling of 213021004122 in words is "two hundred thirteen billion, twenty-one million, four thousand, one hundred twenty-two".