21742354 has 16 divisors (see below), whose sum is σ = 34661088. Its totient is φ = 10193472.

The previous prime is 21742333. The next prime is 21742363. The reversal of 21742354 is 45324712.

It is a super-3 number, since 3×21742354³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

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, 9397 + ... + 11479.

It is an arithmetic number, because the mean of its divisors is an integer number (2166318).

Almost surely, 2^21742354 is an apocalyptic number.

21742354 is a deficient number, since it is larger than the sum of its proper divisors (12918734).

21742354 is a wasteful number, since it uses less digits than its factorization.

21742354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2409.

The product of its digits is 6720, while the sum is 28.

The square root of 21742354 is about 4662.8697172450. The cubic root of 21742354 is about 279.1057952774.

The spelling of 21742354 in words is "twenty-one million, seven hundred forty-two thousand, three hundred fifty-four".