21034371 has 8 divisors (see below), whose sum is σ = 28094464. Its totient is φ = 13998600.

The previous prime is 21034369. The next prime is 21034411. The reversal of 21034371 is 17343012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21034371 - 2¹ = 21034369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3955 + ... + 7596.

It is an arithmetic number, because the mean of its divisors is an integer number (3511808).

Almost surely, 2^21034371 is an apocalyptic number.

21034371 is a deficient number, since it is larger than the sum of its proper divisors (7060093).

21034371 is a wasteful number, since it uses less digits than its factorization.

21034371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12161.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21034371 is about 4586.3243452682. The cubic root of 21034371 is about 276.0428546142.

Adding to 21034371 its reverse (17343012), we get a palindrome (38377383).

The spelling of 21034371 in words is "twenty-one million, thirty-four thousand, three hundred seventy-one".