21061741 has 16 divisors (see below), whose sum is σ = 22675968. Its totient is φ = 19526400.

The previous prime is 21061739. The next prime is 21061757. The reversal of 21061741 is 14716012.

It is a cyclic number.

It is not a de Polignac number, because 21061741 - 2¹ = 21061739 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 (21061771) 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, 92670 + ... + 92896.

It is an arithmetic number, because the mean of its divisors is an integer number (1417248).

Almost surely, 2^21061741 is an apocalyptic number.

It is an amenable number.

21061741 is a deficient number, since it is larger than the sum of its proper divisors (1614227).

21061741 is a wasteful number, since it uses less digits than its factorization.

21061741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 21061741 is about 4589.3072461974. The cubic root of 21061741 is about 276.1625320429.

Adding to 21061741 its reverse (14716012), we get a palindrome (35777753).

The spelling of 21061741 in words is "twenty-one million, sixty-one thousand, seven hundred forty-one".