21949353 has 8 divisors (see below), whose sum is σ = 32517600. Its totient is φ = 14632884.

The previous prime is 21949331. The next prime is 21949373. The reversal of 21949353 is 35394912.

It is a happy number.

It is not a de Polignac number, because 21949353 - 2⁸ = 21949097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21949303) 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, 406443 + ... + 406496.

It is an arithmetic number, because the mean of its divisors is an integer number (4064700).

Almost surely, 2^21949353 is an apocalyptic number.

It is an amenable number.

21949353 is a deficient number, since it is larger than the sum of its proper divisors (10568247).

21949353 is an equidigital number, since it uses as much as digits as its factorization.

21949353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812948 (or 812942 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 21949353 is about 4685.0136605991. The cubic root of 21949353 is about 279.9887452959.

The spelling of 21949353 in words is "twenty-one million, nine hundred forty-nine thousand, three hundred fifty-three".