21220353514 has 4 divisors (see below), whose sum is σ = 31830530274. Its totient is φ = 10610176756.

The previous prime is 21220353503. The next prime is 21220353551. The reversal of 21220353514 is 41535302212.

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

It can be written as a sum of positive squares in only one way, i.e., 21142614025 + 77739489 = 145405^2 + 8817^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305088377 + ... + 5305088380.

Almost surely, 2^21220353514 is an apocalyptic number.

21220353514 is a deficient number, since it is larger than the sum of its proper divisors (10610176760).

21220353514 is a wasteful number, since it uses less digits than its factorization.

21220353514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610176759.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 21220353514 its reverse (41535302212), we get a palindrome (62755655726).

The spelling of 21220353514 in words is "twenty-one billion, two hundred twenty million, three hundred fifty-three thousand, five hundred fourteen".