21623948 has 12 divisors (see below), whose sum is σ = 38647392. Its totient is φ = 10581840.

The previous prime is 21623939. The next prime is 21623963. The reversal of 21623948 is 84932612.

It is a super-3 number, since 3×21623948³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57323 + ... + 57698.

It is an arithmetic number, because the mean of its divisors is an integer number (3220616).

Almost surely, 2^21623948 is an apocalyptic number.

It is an amenable number.

21623948 is a deficient number, since it is larger than the sum of its proper divisors (17023444).

21623948 is a wasteful number, since it uses less digits than its factorization.

21623948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115072 (or 115070 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 21623948 is about 4650.1556963181. The cubic root of 21623948 is about 278.5982149378.

The spelling of 21623948 in words is "twenty-one million, six hundred twenty-three thousand, nine hundred forty-eight".