21213211134 has 16 divisors (see below), whose sum is σ = 42571225872. Its totient is φ = 7046936448.

The previous prime is 21213211127. The next prime is 21213211139. The reversal of 21213211134 is 43111231212.

It is a self number, because there is not a number n which added to its sum of digits gives 21213211134.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213211139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6031579 + ... + 6035094.

It is an arithmetic number, because the mean of its divisors is an integer number (2660701617).

Almost surely, 2^21213211134 is an apocalyptic number.

21213211134 is an abundant number, since it is smaller than the sum of its proper divisors (21358014738).

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

21213211134 is a wasteful number, since it uses less digits than its factorization.

21213211134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12066971.

The product of its digits is 288, while the sum is 21.

Adding to 21213211134 its reverse (43111231212), we get a palindrome (64324442346).

The spelling of 21213211134 in words is "twenty-one billion, two hundred thirteen million, two hundred eleven thousand, one hundred thirty-four".