21960427 has 4 divisors (see below), whose sum is σ = 22320496. Its totient is φ = 21600360.

The previous prime is 21960373. The next prime is 21960439. The reversal of 21960427 is 72406912.

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

It is a cyclic number.

It is not a de Polignac number, because 21960427 - 2⁷ = 21960299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21960457) 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, 179943 + ... + 180064.

It is an arithmetic number, because the mean of its divisors is an integer number (5580124).

Almost surely, 2^21960427 is an apocalyptic number.

21960427 is a deficient number, since it is larger than the sum of its proper divisors (360069).

21960427 is an equidigital number, since it uses as much as digits as its factorization.

21960427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360068.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 21960427 is about 4686.1953651123. The cubic root of 21960427 is about 280.0358244979.

The spelling of 21960427 in words is "twenty-one million, nine hundred sixty thousand, four hundred twenty-seven".