21202516 has 12 divisors (see below), whose sum is σ = 37552032. Its totient is φ = 10473368.

The previous prime is 21202513. The next prime is 21202541. The reversal of 21202516 is 61520212.

It is a junction number, because it is equal to n+sod(n) for n = 21202493 and 21202502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31600 + ... + 32263.

It is an arithmetic number, because the mean of its divisors is an integer number (3129336).

Almost surely, 2^21202516 is an apocalyptic number.

It is an amenable number.

21202516 is a deficient number, since it is larger than the sum of its proper divisors (16349516).

21202516 is a wasteful number, since it uses less digits than its factorization.

21202516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63950 (or 63948 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 21202516 is about 4604.6189853233. The cubic root of 21202516 is about 276.7764490694.

Adding to 21202516 its reverse (61520212), we get a palindrome (82722728).

The spelling of 21202516 in words is "twenty-one million, two hundred two thousand, five hundred sixteen".