21368948 has 6 divisors (see below), whose sum is σ = 37395666. Its totient is φ = 10684472.

The previous prime is 21368927. The next prime is 21368953. The reversal of 21368948 is 84986312.

It can be written as a sum of positive squares in only one way, i.e., 13235044 + 8133904 = 3638^2 + 2852^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2671115 + ... + 2671122.

It is an arithmetic number, because the mean of its divisors is an integer number (6232611).

Almost surely, 2^21368948 is an apocalyptic number.

It is an amenable number.

21368948 is a deficient number, since it is larger than the sum of its proper divisors (16026718).

21368948 is a wasteful number, since it uses less digits than its factorization.

21368948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5342241 (or 5342239 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 21368948 is about 4622.6559465312. The cubic root of 21368948 is about 277.4987603765.

The spelling of 21368948 in words is "twenty-one million, three hundred sixty-eight thousand, nine hundred forty-eight".