21022123214 has 4 divisors (see below), whose sum is σ = 31533184824. Its totient is φ = 10511061606.

The previous prime is 21022123193. The next prime is 21022123223. The reversal of 21022123214 is 41232122012.

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, 5255530802 + ... + 5255530805.

It is an arithmetic number, because the mean of its divisors is an integer number (7883296206).

Almost surely, 2^21022123214 is an apocalyptic number.

21022123214 is a deficient number, since it is larger than the sum of its proper divisors (10511061610).

21022123214 is a wasteful number, since it uses less digits than its factorization.

21022123214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10511061609.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21022123214 its reverse (41232122012), we get a palindrome (62254245226).

The spelling of 21022123214 in words is "twenty-one billion, twenty-two million, one hundred twenty-three thousand, two hundred fourteen".