21255156214 has 4 divisors (see below), whose sum is σ = 31882734324. Its totient is φ = 10627578106.

The previous prime is 21255156203. The next prime is 21255156217. The reversal of 21255156214 is 41265155212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21255156214.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255156217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5313789052 + ... + 5313789055.

It is an arithmetic number, because the mean of its divisors is an integer number (7970683581).

Almost surely, 2^21255156214 is an apocalyptic number.

21255156214 is a deficient number, since it is larger than the sum of its proper divisors (10627578110).

21255156214 is a wasteful number, since it uses less digits than its factorization.

21255156214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10627578109.

The product of its digits is 24000, while the sum is 34.

The spelling of 21255156214 in words is "twenty-one billion, two hundred fifty-five million, one hundred fifty-six thousand, two hundred fourteen".