21141771 has 8 divisors (see below), whose sum is σ = 32216064. Its totient is φ = 12081000.

The previous prime is 21141751. The next prime is 21141779. The reversal of 21141771 is 17714112.

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

It is not a de Polignac number, because 21141771 - 2⁶ = 21141707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21141779) 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, 503355 + ... + 503396.

It is an arithmetic number, because the mean of its divisors is an integer number (4027008).

Almost surely, 2^21141771 is an apocalyptic number.

21141771 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21141771 is a deficient number, since it is larger than the sum of its proper divisors (11074293).

21141771 is a wasteful number, since it uses less digits than its factorization.

21141771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006761.

The product of its digits is 392, while the sum is 24.

The square root of 21141771 is about 4598.0181600337. The cubic root of 21141771 is about 276.5118756392.

Adding to 21141771 its reverse (17714112), we get a palindrome (38855883).

It can be divided in two parts, 21141 and 771, that added together give a palindrome (21912).

The spelling of 21141771 in words is "twenty-one million, one hundred forty-one thousand, seven hundred seventy-one".