21213225134 has 4 divisors (see below), whose sum is σ = 31819837704. Its totient is φ = 10606612566.

The previous prime is 21213225119. The next prime is 21213225169. The reversal of 21213225134 is 43152231212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303306282 + ... + 5303306285.

It is an arithmetic number, because the mean of its divisors is an integer number (7954959426).

Almost surely, 2^21213225134 is an apocalyptic number.

21213225134 is a deficient number, since it is larger than the sum of its proper divisors (10606612570).

21213225134 is a wasteful number, since it uses less digits than its factorization.

21213225134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10606612569.

The product of its digits is 2880, while the sum is 26.

Adding to 21213225134 its reverse (43152231212), we get a palindrome (64365456346).

The spelling of 21213225134 in words is "twenty-one billion, two hundred thirteen million, two hundred twenty-five thousand, one hundred thirty-four".