21111741 has 12 divisors (see below), whose sum is σ = 34851232. Its totient is φ = 12063816.

The previous prime is 21111703. The next prime is 21111743. The reversal of 21111741 is 14711112.

It is not a de Polignac number, because 21111741 - 2¹³ = 21103549 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 (21111743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167491 + ... + 167616.

Almost surely, 2^21111741 is an apocalyptic number.

21111741 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21111741 is a deficient number, since it is larger than the sum of its proper divisors (13739491).

21111741 is a wasteful number, since it uses less digits than its factorization.

21111741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335120 (or 335117 counting only the distinct ones).

The product of its digits is 56, while the sum is 18.

The square root of 21111741 is about 4594.7514622665. The cubic root of 21111741 is about 276.3808934513.

Adding to 21111741 its reverse (14711112), we get a palindrome (35822853).

The spelling of 21111741 in words is "twenty-one million, one hundred eleven thousand, seven hundred forty-one".