21562349 has 4 divisors (see below), whose sum is σ = 21681660. Its totient is φ = 21443040.

The previous prime is 21562313. The next prime is 21562369. The reversal of 21562349 is 94326512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 310249 + 21252100 = 557^2 + 4610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21562349 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 (21562309) 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, 59384 + ... + 59745.

It is an arithmetic number, because the mean of its divisors is an integer number (5420415).

Almost surely, 2^21562349 is an apocalyptic number.

It is an amenable number.

21562349 is a deficient number, since it is larger than the sum of its proper divisors (119311).

21562349 is a wasteful number, since it uses less digits than its factorization.

21562349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119310.

The product of its digits is 12960, while the sum is 32.

The square root of 21562349 is about 4643.5276460898. The cubic root of 21562349 is about 278.3334206636. Note that the first 3 decimals are identical.

The spelling of 21562349 in words is "twenty-one million, five hundred sixty-two thousand, three hundred forty-nine".