21948995 has 4 divisors (see below), whose sum is σ = 26338800. Its totient is φ = 17559192.

The previous prime is 21948973. The next prime is 21949001. The reversal of 21948995 is 59984912.

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 21948995 - 2⁶ = 21948931 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2194895 + ... + 2194904.

It is an arithmetic number, because the mean of its divisors is an integer number (6584700).

Almost surely, 2^21948995 is an apocalyptic number.

21948995 is a deficient number, since it is larger than the sum of its proper divisors (4389805).

21948995 is an equidigital number, since it uses as much as digits as its factorization.

21948995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4389804.

The product of its digits is 233280, while the sum is 47.

The square root of 21948995 is about 4684.9754535109. The cubic root of 21948995 is about 279.9872230564.

The spelling of 21948995 in words is "twenty-one million, nine hundred forty-eight thousand, nine hundred ninety-five".