21160051 has 8 divisors (see below), whose sum is σ = 23127408. Its totient is φ = 19200000.

The previous prime is 21160043. The next prime is 21160079. The reversal of 21160051 is 15006112.

It is a happy number.

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

It is a 11-Lehmer number, since φ(21160051) divides (21160051-1)¹¹.

It is a cyclic number.

It is not a de Polignac number, because 21160051 - 2³ = 21160043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21160001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5551 + ... + 8551.

It is an arithmetic number, because the mean of its divisors is an integer number (2890926).

Almost surely, 2^21160051 is an apocalyptic number.

21160051 is a deficient number, since it is larger than the sum of its proper divisors (1967357).

21160051 is a wasteful number, since it uses less digits than its factorization.

21160051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3653.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 21160051 is about 4600.0055434749. The cubic root of 21160051 is about 276.5915469997.

Adding to 21160051 its reverse (15006112), we get a palindrome (36166163).

The spelling of 21160051 in words is "twenty-one million, one hundred sixty thousand, fifty-one".