21851068 has 6 divisors (see below), whose sum is σ = 38239376. Its totient is φ = 10925532.

The previous prime is 21851057. The next prime is 21851077. The reversal of 21851068 is 86015812.

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, 2731380 + ... + 2731387.

Almost surely, 2^21851068 is an apocalyptic number.

It is an amenable number.

21851068 is a deficient number, since it is larger than the sum of its proper divisors (16388308).

21851068 is a wasteful number, since it uses less digits than its factorization.

21851068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5462771 (or 5462769 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 21851068 is about 4674.5125949130. The cubic root of 21851068 is about 279.5702079659.

The spelling of 21851068 in words is "twenty-one million, eight hundred fifty-one thousand, sixty-eight".