21354974 has 8 divisors (see below), whose sum is σ = 33718440. Its totient is φ = 10115496.

The previous prime is 21354959. The next prime is 21354979. The reversal of 21354974 is 47945312.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280949 + ... + 281024.

It is an arithmetic number, because the mean of its divisors is an integer number (4214805).

Almost surely, 2^21354974 is an apocalyptic number.

21354974 is a deficient number, since it is larger than the sum of its proper divisors (12363466).

21354974 is a wasteful number, since it uses less digits than its factorization.

21354974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561994.

The product of its digits is 30240, while the sum is 35.

The square root of 21354974 is about 4621.1442305992. The cubic root of 21354974 is about 277.4382580491.

The spelling of 21354974 in words is "twenty-one million, three hundred fifty-four thousand, nine hundred seventy-four".