21034213 has 8 divisors (see below), whose sum is σ = 22657536. Its totient is φ = 19470000.

The previous prime is 21034201. The next prime is 21034229. The reversal of 21034213 is 31243012.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21034213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14038 + ... + 15463.

It is an arithmetic number, because the mean of its divisors is an integer number (2832192).

Almost surely, 2^21034213 is an apocalyptic number.

21034213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21034213 is a deficient number, since it is larger than the sum of its proper divisors (1623323).

21034213 is a wasteful number, since it uses less digits than its factorization.

21034213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29555.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21034213 is about 4586.3071201131. The cubic root of 21034213 is about 276.0421634458.

Adding to 21034213 its reverse (31243012), we get a palindrome (52277225).

The spelling of 21034213 in words is "twenty-one million, thirty-four thousand, two hundred thirteen".