21793970 has 16 divisors (see below), whose sum is σ = 42795648. Its totient is φ = 7925040.

The previous prime is 21793927. The next prime is 21793973. The reversal of 21793970 is 7939712.

It is not an unprimeable number, because it can be changed into a prime (21793973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98954 + ... + 99173.

It is an arithmetic number, because the mean of its divisors is an integer number (2674728).

Almost surely, 2^21793970 is an apocalyptic number.

21793970 is a deficient number, since it is larger than the sum of its proper divisors (21001678).

21793970 is a wasteful number, since it uses less digits than its factorization.

21793970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198145.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 21793970 is about 4668.4012252590. The cubic root of 21793970 is about 279.3264849601.

The spelling of 21793970 in words is "twenty-one million, seven hundred ninety-three thousand, nine hundred seventy".