21021514 has 4 divisors (see below), whose sum is σ = 31532274. Its totient is φ = 10510756.

The previous prime is 21021499. The next prime is 21021529. The reversal of 21021514 is 41512012.

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

It is an interprime number because it is at equal distance from previous prime (21021499) and next prime (21021529).

It can be written as a sum of positive squares in only one way, i.e., 20857489 + 164025 = 4567^2 + 405^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255377 + ... + 5255380.

Almost surely, 2^21021514 is an apocalyptic number.

21021514 is a deficient number, since it is larger than the sum of its proper divisors (10510760).

21021514 is a wasteful number, since it uses less digits than its factorization.

21021514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510759.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 21021514 is about 4584.9224639027. The cubic root of 21021514 is about 275.9866005537.

Adding to 21021514 its reverse (41512012), we get a palindrome (62533526).

The spelling of 21021514 in words is "twenty-one million, twenty-one thousand, five hundred fourteen".