21114742 has 12 divisors (see below), whose sum is σ = 34813548. Its totient is φ = 9597500.

The previous prime is 21114727. The next prime is 21114749. The reversal of 21114742 is 24741112.

It is a Harshad number since it is a multiple of its sum of digits (22).

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43384 + ... + 43867.

It is an arithmetic number, because the mean of its divisors is an integer number (2901129).

Almost surely, 2^21114742 is an apocalyptic number.

21114742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21114742 is a deficient number, since it is larger than the sum of its proper divisors (13698806).

21114742 is a wasteful number, since it uses less digits than its factorization.

21114742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87275 (or 87264 counting only the distinct ones).

The product of its digits is 448, while the sum is 22.

The square root of 21114742 is about 4595.0780189242. The cubic root of 21114742 is about 276.3939885306.

Adding to 21114742 its reverse (24741112), we get a palindrome (45855854).

The spelling of 21114742 in words is "twenty-one million, one hundred fourteen thousand, seven hundred forty-two".