21969470 has 16 divisors (see below), whose sum is σ = 39677040. Its totient is φ = 8758464.

The previous prime is 21969461. The next prime is 21969503. The reversal of 21969470 is 7496912.

It is a super-2 number, since 2×21969470² = 965315224161800, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380 + ... + 6639.

It is an arithmetic number, because the mean of its divisors is an integer number (2479815).

Almost surely, 2^21969470 is an apocalyptic number.

21969470 is a deficient number, since it is larger than the sum of its proper divisors (17707570).

21969470 is a wasteful number, since it uses less digits than its factorization.

21969470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7339.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 21969470 is about 4687.1601210114. The cubic root of 21969470 is about 280.0742575156.

The spelling of 21969470 in words is "twenty-one million, nine hundred sixty-nine thousand, four hundred seventy".