21020514 has 16 divisors (see below), whose sum is σ = 43177728. Its totient is φ = 6817392.

The previous prime is 21020509. The next prime is 21020521. The reversal of 21020514 is 41502012.

It is a junction number, because it is equal to n+sod(n) for n = 21020493 and 21020502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47122 + ... + 47565.

It is an arithmetic number, because the mean of its divisors is an integer number (2698608).

Almost surely, 2^21020514 is an apocalyptic number.

21020514 is an abundant number, since it is smaller than the sum of its proper divisors (22157214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21020514 is a wasteful number, since it uses less digits than its factorization.

21020514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94729.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21020514 is about 4584.8134095075. The cubic root of 21020514 is about 275.9822242280.

Adding to 21020514 its reverse (41502012), we get a palindrome (62522526).

The spelling of 21020514 in words is "twenty-one million, twenty thousand, five hundred fourteen".