21162701 has 8 divisors (see below), whose sum is σ = 24321024. Its totient is φ = 18038160.

The previous prime is 21162697. The next prime is 21162709. The reversal of 21162701 is 10726112.

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

It is not a de Polignac number, because 21162701 - 2² = 21162697 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21162709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7085 + ... + 9618.

It is an arithmetic number, because the mean of its divisors is an integer number (3040128).

Almost surely, 2^21162701 is an apocalyptic number.

It is an amenable number.

21162701 is a deficient number, since it is larger than the sum of its proper divisors (3158323).

21162701 is a wasteful number, since it uses less digits than its factorization.

21162701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16891.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 21162701 is about 4600.2935775883. The cubic root of 21162701 is about 276.6030929234.

Adding to 21162701 its reverse (10726112), we get a palindrome (31888813).

The spelling of 21162701 in words is "twenty-one million, one hundred sixty-two thousand, seven hundred one".