21742914 has 16 divisors (see below), whose sum is σ = 43532928. Its totient is φ = 7239792.

The previous prime is 21742913. The next prime is 21742961. The reversal of 21742914 is 41924712.

It is a super-2 number, since 2×21742914² = 945508618422792, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21742913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7704 + ... + 10140.

It is an arithmetic number, because the mean of its divisors is an integer number (2720808).

Almost surely, 2^21742914 is an apocalyptic number.

21742914 is an abundant number, since it is smaller than the sum of its proper divisors (21790014).

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

21742914 is a wasteful number, since it uses less digits than its factorization.

21742914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3929.

The product of its digits is 4032, while the sum is 30.

The square root of 21742914 is about 4662.9297657160. The cubic root of 21742914 is about 279.1081914900.

The spelling of 21742914 in words is "twenty-one million, seven hundred forty-two thousand, nine hundred fourteen".