21371370134 has 4 divisors (see below), whose sum is σ = 32057055204. Its totient is φ = 10685685066.

The previous prime is 21371370127. The next prime is 21371370173. The reversal of 21371370134 is 43107317312.

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

It is a super-2 number, since 2×21371370134² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21371370134.

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, 5342842532 + ... + 5342842535.

It is an arithmetic number, because the mean of its divisors is an integer number (8014263801).

Almost surely, 2^21371370134 is an apocalyptic number.

21371370134 is a deficient number, since it is larger than the sum of its proper divisors (10685685070).

21371370134 is a wasteful number, since it uses less digits than its factorization.

21371370134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10685685069.

The product of its (nonzero) digits is 10584, while the sum is 32.

Adding to 21371370134 its reverse (43107317312), we get a palindrome (64478687446).

The spelling of 21371370134 in words is "twenty-one billion, three hundred seventy-one million, three hundred seventy thousand, one hundred thirty-four".