21210519 has 16 divisors (see below), whose sum is σ = 30948480. Its totient is φ = 12814560.

The previous prime is 21210499. The next prime is 21210521. The reversal of 21210519 is 91501212.

It is not a de Polignac number, because 21210519 - 2⁵ = 21210487 is a prime.

It is a super-2 number, since 2×21210519² = 899772232498722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21210495 and 21210504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12292 + ... + 13910.

It is an arithmetic number, because the mean of its divisors is an integer number (1934280).

Almost surely, 2^21210519 is an apocalyptic number.

21210519 is a deficient number, since it is larger than the sum of its proper divisors (9737961).

21210519 is a wasteful number, since it uses less digits than its factorization.

21210519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 21210519 is about 4605.4879220339. The cubic root of 21210519 is about 276.8112682592.

It can be divided in two parts, 212 and 10519, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 21210519 in words is "twenty-one million, two hundred ten thousand, five hundred nineteen".