21414040 has 16 divisors (see below), whose sum is σ = 48181680. Its totient is φ = 8565600.

The previous prime is 21414037. The next prime is 21414047. The reversal of 21414040 is 4041412.

It is a super-2 number, since 2×21414040² = 917122218243200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21414047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267636 + ... + 267715.

It is an arithmetic number, because the mean of its divisors is an integer number (3011355).

Almost surely, 2^21414040 is an apocalyptic number.

21414040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21414040 is an abundant number, since it is smaller than the sum of its proper divisors (26767640).

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

21414040 is a wasteful number, since it uses less digits than its factorization.

21414040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535362 (or 535358 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 21414040 is about 4627.5306590016. The cubic root of 21414040 is about 277.6938126072.

Adding to 21414040 its reverse (4041412), we get a palindrome (25455452).

The spelling of 21414040 in words is "twenty-one million, four hundred fourteen thousand, forty".