21734424 has 24 divisors (see below), whose sum is σ = 58864260. Its totient is φ = 7244784.

The previous prime is 21734417. The next prime is 21734431. The reversal of 21734424 is 42443712.

21734424 is a `hidden beast` number, since 217 + 3 + 442 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (21734417) and next prime (21734431).

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×21734424² = 944770373223552, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 150862 + ... + 151005.

Almost surely, 2^21734424 is an apocalyptic number.

21734424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21734424 is an abundant number, since it is smaller than the sum of its proper divisors (37129836).

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

21734424 is a wasteful number, since it uses less digits than its factorization.

21734424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301879 (or 301872 counting only the distinct ones).

The product of its digits is 5376, while the sum is 27.

The square root of 21734424 is about 4662.0193049793. The cubic root of 21734424 is about 279.0718587789.

The spelling of 21734424 in words is "twenty-one million, seven hundred thirty-four thousand, four hundred twenty-four".