21347741 has 8 divisors (see below), whose sum is σ = 22415520. Its totient is φ = 20302128.

The previous prime is 21347723. The next prime is 21347771. The reversal of 21347741 is 14774312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21347741 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21347701) 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, 3551 + ... + 7436.

It is an arithmetic number, because the mean of its divisors is an integer number (2801940).

Almost surely, 2^21347741 is an apocalyptic number.

It is an amenable number.

21347741 is a deficient number, since it is larger than the sum of its proper divisors (1067779).

21347741 is a wasteful number, since it uses less digits than its factorization.

21347741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11083.

The product of its digits is 4704, while the sum is 29.

The square root of 21347741 is about 4620.3615659383. The cubic root of 21347741 is about 277.4069314283.

The spelling of 21347741 in words is "twenty-one million, three hundred forty-seven thousand, seven hundred forty-one".