21162741 has 16 divisors (see below), whose sum is σ = 28957824. Its totient is φ = 13742144.

The previous prime is 21162727. The next prime is 21162749. The reversal of 21162741 is 14726112.

It is a cyclic number.

It is not a de Polignac number, because 21162741 - 2⁵ = 21162709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21162749) 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, 26155 + ... + 26951.

It is an arithmetic number, because the mean of its divisors is an integer number (1809864).

Almost surely, 2^21162741 is an apocalyptic number.

It is an amenable number.

21162741 is a deficient number, since it is larger than the sum of its proper divisors (7795083).

21162741 is a wasteful number, since it uses less digits than its factorization.

21162741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020.

The product of its digits is 672, while the sum is 24.

The square root of 21162741 is about 4600.2979251348. The cubic root of 21162741 is about 276.6032671941.

Adding to 21162741 its reverse (14726112), we get a palindrome (35888853).

The spelling of 21162741 in words is "twenty-one million, one hundred sixty-two thousand, seven hundred forty-one".