21022514 has 4 divisors (see below), whose sum is σ = 31533774. Its totient is φ = 10511256.

The previous prime is 21022471. The next prime is 21022517. The reversal of 21022514 is 41522012.

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., 21022225 + 289 = 4585^2 + 17^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21022492 and 21022501.

It is not an unprimeable number, because it can be changed into a prime (21022517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255627 + ... + 5255630.

Almost surely, 2^21022514 is an apocalyptic number.

21022514 is a deficient number, since it is larger than the sum of its proper divisors (10511260).

21022514 is a wasteful number, since it uses less digits than its factorization.

21022514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10511259.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21022514 is about 4585.0315157041. The cubic root of 21022514 is about 275.9909767406.

Adding to 21022514 its reverse (41522012), we get a palindrome (62544526).

The spelling of 21022514 in words is "twenty-one million, twenty-two thousand, five hundred fourteen".