21061711 has 8 divisors (see below), whose sum is σ = 23011200. Its totient is φ = 19118040.

The previous prime is 21061693. The next prime is 21061717. The reversal of 21061711 is 11716012.

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 21061711 - 2²¹ = 18964559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21061717) 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, 10270 + ... + 12148.

It is an arithmetic number, because the mean of its divisors is an integer number (2876400).

Almost surely, 2^21061711 is an apocalyptic number.

21061711 is a deficient number, since it is larger than the sum of its proper divisors (1949489).

21061711 is a wasteful number, since it uses less digits than its factorization.

21061711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 21061711 is about 4589.3039777291. The cubic root of 21061711 is about 276.1624009224.

Adding to 21061711 its reverse (11716012), we get a palindrome (32777723).

The spelling of 21061711 in words is "twenty-one million, sixty-one thousand, seven hundred eleven".