21959049 has 16 divisors (see below), whose sum is σ = 33963008. Its totient is φ = 12359952.

The previous prime is 21959029. The next prime is 21959051. The reversal of 21959049 is 94095912.

21959049 = 1096² + 1097² + ... + 1113².

It is not a de Polignac number, because 21959049 - 2⁵ = 21959017 is a prime.

It is a super-3 number, since 3×21959049³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21958998 and 21959016.

It is not an unprimeable number, because it can be changed into a prime (21959009) 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 15 ways as a sum of consecutive naturals, for example, 6397 + ... + 9210.

It is an arithmetic number, because the mean of its divisors is an integer number (2122688).

Almost surely, 2^21959049 is an apocalyptic number.

It is an amenable number.

21959049 is a deficient number, since it is larger than the sum of its proper divisors (12003959).

21959049 is a wasteful number, since it uses less digits than its factorization.

21959049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15684.

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 21959049 is about 4686.0483352181. The cubic root of 21959049 is about 280.0299670308.

The spelling of 21959049 in words is "twenty-one million, nine hundred fifty-nine thousand, forty-nine".