21956079 has 8 divisors (see below), whose sum is σ = 29548800. Its totient is φ = 14500376.

The previous prime is 21956069. The next prime is 21956089. The reversal of 21956079 is 97065912.

It is an interprime number because it is at equal distance from previous prime (21956069) and next prime (21956089).

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

It is a cyclic number.

It is not a de Polignac number, because 21956079 - 2⁹ = 21955567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21956009) 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, 33879 + ... + 34520.

It is an arithmetic number, because the mean of its divisors is an integer number (3693600).

Almost surely, 2^21956079 is an apocalyptic number.

21956079 is a deficient number, since it is larger than the sum of its proper divisors (7592721).

21956079 is a wasteful number, since it uses less digits than its factorization.

21956079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68509.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 21956079 is about 4685.7314263624. The cubic root of 21956079 is about 280.0173416130.

The spelling of 21956079 in words is "twenty-one million, nine hundred fifty-six thousand, seventy-nine".