213021123012 has 36 divisors (see below), whose sum is σ = 538897872240. Its totient is φ = 70950626352.

The previous prime is 213021123001. The next prime is 213021123053. The reversal of 213021123012 is 210321120312.

213021123012 is a `hidden beast` number, since 213 + 0 + 211 + 230 + 12 = 666.

213021123012 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

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

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, 2304658 + ... + 2395305.

It is an arithmetic number, because the mean of its divisors is an integer number (14969385340).

Almost surely, 2^213021123012 is an apocalyptic number.

It is an amenable number.

213021123012 is an abundant number, since it is smaller than the sum of its proper divisors (325876749228).

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

213021123012 is a wasteful number, since it uses less digits than its factorization.

213021123012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4701232 (or 4701227 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 213021123012 its reverse (210321120312), we get a palindrome (423342243324).

The spelling of 213021123012 in words is "two hundred thirteen billion, twenty-one million, one hundred twenty-three thousand, twelve".