21675470 has 32 divisors (see below), whose sum is σ = 41368320. Its totient is φ = 8162560.

The previous prime is 21675461. The next prime is 21675473. The reversal of 21675470 is 7457612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21675473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10979 + ... + 12801.

It is an arithmetic number, because the mean of its divisors is an integer number (1292760).

Almost surely, 2^21675470 is an apocalyptic number.

21675470 is a deficient number, since it is larger than the sum of its proper divisors (19692850).

21675470 is a wasteful number, since it uses less digits than its factorization.

21675470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 21675470 is about 4655.6922149128. The cubic root of 21675470 is about 278.8193054964.

The spelling of 21675470 in words is "twenty-one million, six hundred seventy-five thousand, four hundred seventy".