21401470 has 48 divisors (see below), whose sum is σ = 42468624. Its totient is φ = 7737600.

The previous prime is 21401461. The next prime is 21401473. The reversal of 21401470 is 7410412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401473) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163305 + ... + 163435.

It is an arithmetic number, because the mean of its divisors is an integer number (884763).

Almost surely, 2^21401470 is an apocalyptic number.

21401470 is a deficient number, since it is larger than the sum of its proper divisors (21067154).

21401470 is a wasteful number, since it uses less digits than its factorization.

21401470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 21401470 is about 4626.1722838649. The cubic root of 21401470 is about 277.6394667288.

Adding to 21401470 its reverse (7410412), we get a palindrome (28811882).

The spelling of 21401470 in words is "twenty-one million, four hundred one thousand, four hundred seventy".