21037219 has 8 divisors (see below), whose sum is σ = 24533600. Its totient is φ = 18031608.

The previous prime is 21037207. The next prime is 21037231. The reversal of 21037219 is 91273012.

21037219 = 56² + 57² + ... + 398².

It is an interprime number because it is at equal distance from previous prime (21037207) and next prime (21037231).

It is not a de Polignac number, because 21037219 - 2⁵ = 21037187 is a prime.

It is a super-2 number, since 2×21037219² = 885129166507922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21037193 and 21037202.

It is not an unprimeable number, because it can be changed into a prime (21037259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30324 + ... + 31009.

It is an arithmetic number, because the mean of its divisors is an integer number (3066700).

Almost surely, 2^21037219 is an apocalyptic number.

21037219 is a deficient number, since it is larger than the sum of its proper divisors (3496381).

21037219 is an frugal number, since it uses more digits than its factorization.

21037219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61354 (or 61340 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 21037219 is about 4586.6348230484. The cubic root of 21037219 is about 276.0553125507.

The spelling of 21037219 in words is "twenty-one million, thirty-seven thousand, two hundred nineteen".