21114740 has 12 divisors (see below), whose sum is σ = 44340996. Its totient is φ = 8445888.

The previous prime is 21114727. The next prime is 21114749. The reversal of 21114740 is 4741112.

It can be written as a sum of positive squares in 2 ways, for example, as 10316944 + 10797796 = 3212^2 + 3286^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1055737 = 21114740 / (2 + 1 + 1 + 1 + 4 + 7 + 4 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114749) 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, 527849 + ... + 527888.

It is an arithmetic number, because the mean of its divisors is an integer number (3695083).

Almost surely, 2^21114740 is an apocalyptic number.

21114740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21114740 is an abundant number, since it is smaller than the sum of its proper divisors (23226256).

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

21114740 is a wasteful number, since it uses less digits than its factorization.

21114740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055746 (or 1055744 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 21114740 is about 4595.0778013000. The cubic root of 21114740 is about 276.3939798039.

Adding to 21114740 its reverse (4741112), we get a palindrome (25855852).

The spelling of 21114740 in words is "twenty-one million, one hundred fourteen thousand, seven hundred forty".