21161054 has 8 divisors (see below), whose sum is σ = 31782360. Its totient is φ = 10566936.

The previous prime is 21161051. The next prime is 21161059. The reversal of 21161054 is 45016112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4724 + ... + 8039.

It is an arithmetic number, because the mean of its divisors is an integer number (3972795).

Almost surely, 2^21161054 is an apocalyptic number.

21161054 is a deficient number, since it is larger than the sum of its proper divisors (10621306).

21161054 is a wasteful number, since it uses less digits than its factorization.

21161054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13594.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 21161054 is about 4600.1145637908. The cubic root of 21161054 is about 276.5959171362.

Adding to 21161054 its reverse (45016112), we get a palindrome (66177166).

The spelling of 21161054 in words is "twenty-one million, one hundred sixty-one thousand, fifty-four".