21221210134 has 8 divisors (see below), whose sum is σ = 31850446320. Its totient is φ = 10604394696.

The previous prime is 21221210119. The next prime is 21221210137. The reversal of 21221210134 is 43101212212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221210137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3100914 + ... + 3107749.

It is an arithmetic number, because the mean of its divisors is an integer number (3981305790).

Almost surely, 2^21221210134 is an apocalyptic number.

21221210134 is a deficient number, since it is larger than the sum of its proper divisors (10629236186).

21221210134 is a wasteful number, since it uses less digits than its factorization.

21221210134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6210374.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21221210134 its reverse (43101212212), we get a palindrome (64322422346).

The spelling of 21221210134 in words is "twenty-one billion, two hundred twenty-one million, two hundred ten thousand, one hundred thirty-four".