21342711 has 8 divisors (see below), whose sum is σ = 30646000. Its totient is φ = 13133952.

The previous prime is 21342709. The next prime is 21342721. The reversal of 21342711 is 11724312.

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

It is not a de Polignac number, because 21342711 - 2¹ = 21342709 is a prime.

It is a super-2 number, since 2×21342711² = 911022625659042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342721) 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, 273586 + ... + 273663.

It is an arithmetic number, because the mean of its divisors is an integer number (3830750).

Almost surely, 2^21342711 is an apocalyptic number.

21342711 is a deficient number, since it is larger than the sum of its proper divisors (9303289).

21342711 is a wasteful number, since it uses less digits than its factorization.

21342711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547265.

The product of its digits is 336, while the sum is 21.

The square root of 21342711 is about 4619.8172041759. The cubic root of 21342711 is about 277.3851419803.

It can be divided in two parts, 213 and 42711, that added together give a palindrome (42924).

The spelling of 21342711 in words is "twenty-one million, three hundred forty-two thousand, seven hundred eleven".