21754470 has 16 divisors (see below), whose sum is σ = 52210800. Its totient is φ = 5801184.

The previous prime is 21754463. The next prime is 21754489. The reversal of 21754470 is 7445712.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 725149 = 21754470 / (2 + 1 + 7 + 5 + 4 + 4 + 7 + 0).

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, 362545 + ... + 362604.

It is an arithmetic number, because the mean of its divisors is an integer number (3263175).

Almost surely, 2^21754470 is an apocalyptic number.

21754470 is an abundant number, since it is smaller than the sum of its proper divisors (30456330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21754470 is a wasteful number, since it uses less digits than its factorization.

21754470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725159.

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 21754470 is about 4664.1687362273. The cubic root of 21754470 is about 279.1576298651.

The spelling of 21754470 in words is "twenty-one million, seven hundred fifty-four thousand, four hundred seventy".