21401120 has 48 divisors (see below), whose sum is σ = 54454680. Its totient is φ = 7901184.

The previous prime is 21401119. The next prime is 21401123. The reversal of 21401120 is 2110412.

It can be written as a sum of positive squares in 4 ways, for example, as 17606416 + 3794704 = 4196^2 + 1948^2 .

It is not an unprimeable number, because it can be changed into a prime (21401123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3065 + ... + 7224.

Almost surely, 2^21401120 is an apocalyptic number.

21401120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21401120 is an abundant number, since it is smaller than the sum of its proper divisors (33053560).

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

21401120 is a wasteful number, since it uses less digits than its factorization.

21401120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10317 (or 10309 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21401120 is about 4626.1344554606. The cubic root of 21401120 is about 277.6379532137.

Adding to 21401120 its reverse (2110412), we get a palindrome (23511532).

The spelling of 21401120 in words is "twenty-one million, four hundred one thousand, one hundred twenty".