21401460 has 36 divisors (see below), whose sum is σ = 64918308. Its totient is φ = 5707008.

The previous prime is 21401447. The next prime is 21401461. The reversal of 21401460 is 6410412.

It can be written as a sum of positive squares in 2 ways, for example, as 2842596 + 18558864 = 1686^2 + 4308^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59269 + ... + 59628.

Almost surely, 2^21401460 is an apocalyptic number.

21401460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21401460 is an abundant number, since it is smaller than the sum of its proper divisors (43516848).

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

21401460 is a wasteful number, since it uses less digits than its factorization.

21401460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118912 (or 118907 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21401460 is about 4626.1712030577. The cubic root of 21401460 is about 277.6394234857.

Adding to 21401460 its reverse (6410412), we get a palindrome (27811872).

It can be divided in two parts, 2140 and 1460, that added together give a square (3600 = 60²).

The spelling of 21401460 in words is "twenty-one million, four hundred one thousand, four hundred sixty".