21452711 has 16 divisors (see below), whose sum is σ = 25437504. Its totient is φ = 17708544.

The previous prime is 21452701. The next prime is 21452731. The reversal of 21452711 is 11725412.

It is a de Polignac number, because none of the positive numbers 2^k-21452711 is a prime.

It is a super-3 number, since 3×21452711³ (a number of 23 digits) contains 333 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 (21452701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28901 + ... + 29633.

It is an arithmetic number, because the mean of its divisors is an integer number (1589844).

Almost surely, 2^21452711 is an apocalyptic number.

21452711 is a deficient number, since it is larger than the sum of its proper divisors (3984793).

21452711 is a wasteful number, since it uses less digits than its factorization.

21452711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890.

The product of its digits is 560, while the sum is 23.

The square root of 21452711 is about 4631.7071366830. The cubic root of 21452711 is about 277.8608718461.

It can be divided in two parts, 214 and 52711, that added together give a palindrome (52925).

The spelling of 21452711 in words is "twenty-one million, four hundred fifty-two thousand, seven hundred eleven".