21123130214 has 4 divisors (see below), whose sum is σ = 31684695324. Its totient is φ = 10561565106.

The previous prime is 21123130153. The next prime is 21123130219. The reversal of 21123130214 is 41203132112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123130219) 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 as a sum of consecutive naturals, namely, 5280782552 + ... + 5280782555.

It is an arithmetic number, because the mean of its divisors is an integer number (7921173831).

Almost surely, 2^21123130214 is an apocalyptic number.

21123130214 is a deficient number, since it is larger than the sum of its proper divisors (10561565110).

21123130214 is a wasteful number, since it uses less digits than its factorization.

21123130214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10561565109.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21123130214 its reverse (41203132112), we get a palindrome (62326262326).

The spelling of 21123130214 in words is "twenty-one billion, one hundred twenty-three million, one hundred thirty thousand, two hundred fourteen".