21302349 has 16 divisors (see below), whose sum is σ = 28991424. Its totient is φ = 13910400.

The previous prime is 21302321. The next prime is 21302371. The reversal of 21302349 is 94320312.

It is not a de Polignac number, because 21302349 - 2⁷ = 21302221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45979 + ... + 46439.

It is an arithmetic number, because the mean of its divisors is an integer number (1811964).

Almost surely, 2^21302349 is an apocalyptic number.

It is an amenable number.

21302349 is a deficient number, since it is larger than the sum of its proper divisors (7689075).

21302349 is a wasteful number, since it uses less digits than its factorization.

21302349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 21302349 is about 4615.4467822736. The cubic root of 21302349 is about 277.2101738279.

The spelling of 21302349 in words is "twenty-one million, three hundred two thousand, three hundred forty-nine".