21734949 has 8 divisors (see below), whose sum is σ = 29979360. Its totient is φ = 13990256.

The previous prime is 21734941. The next prime is 21734953. The reversal of 21734949 is 94943712.

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

It is a cyclic number.

It is not a de Polignac number, because 21734949 - 2³ = 21734941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21734941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124827 + ... + 125000.

It is an arithmetic number, because the mean of its divisors is an integer number (3747420).

Almost surely, 2^21734949 is an apocalyptic number.

21734949 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21734949 is a deficient number, since it is larger than the sum of its proper divisors (8244411).

21734949 is a wasteful number, since it uses less digits than its factorization.

21734949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249859.

The product of its digits is 54432, while the sum is 39.

The square root of 21734949 is about 4662.0756107125. The cubic root of 21734949 is about 279.0741057757.

The spelling of 21734949 in words is "twenty-one million, seven hundred thirty-four thousand, nine hundred forty-nine".