21911434 has 8 divisors (see below), whose sum is σ = 32989248. Its totient is φ = 10915020.

The previous prime is 21911431. The next prime is 21911441. The reversal of 21911434 is 43411912.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21911434² = 960221879872712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21911399 and 21911408.

It is not an unprimeable number, because it can be changed into a prime (21911431) 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 3 ways as a sum of consecutive naturals, for example, 19672 + ... + 20755.

It is an arithmetic number, because the mean of its divisors is an integer number (4123656).

Almost surely, 2^21911434 is an apocalyptic number.

21911434 is a deficient number, since it is larger than the sum of its proper divisors (11077814).

21911434 is a wasteful number, since it uses less digits than its factorization.

21911434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40700.

The product of its digits is 864, while the sum is 25.

The square root of 21911434 is about 4680.9650714356. The cubic root of 21911434 is about 279.8274191601.

The spelling of 21911434 in words is "twenty-one million, nine hundred eleven thousand, four hundred thirty-four".