21012514 has 4 divisors (see below), whose sum is σ = 31518774. Its totient is φ = 10506256.

The previous prime is 21012503. The next prime is 21012517. The reversal of 21012514 is 41521012.

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., 19492225 + 1520289 = 4415^2 + 1233^2 .

It is not an unprimeable number, because it can be changed into a prime (21012517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253127 + ... + 5253130.

Almost surely, 2^21012514 is an apocalyptic number.

21012514 is a deficient number, since it is larger than the sum of its proper divisors (10506260).

21012514 is a wasteful number, since it uses less digits than its factorization.

21012514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10506259.

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

The square root of 21012514 is about 4583.9408809451. The cubic root of 21012514 is about 275.9472086246.

Adding to 21012514 its reverse (41521012), we get a palindrome (62533526).

The spelling of 21012514 in words is "twenty-one million, twelve thousand, five hundred fourteen".