21963161 has 8 divisors (see below), whose sum is σ = 24067200. Its totient is φ = 19877040.

The previous prime is 21963143. The next prime is 21963187. The reversal of 21963161 is 16136912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21963161 is a prime.

It is a super-2 number, since 2×21963161² = 964760882223842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21963191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1841 + ... + 6878.

It is an arithmetic number, because the mean of its divisors is an integer number (3008400).

Almost surely, 2^21963161 is an apocalyptic number.

It is an amenable number.

21963161 is a deficient number, since it is larger than the sum of its proper divisors (2104039).

21963161 is a wasteful number, since it uses less digits than its factorization.

21963161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8959.

The product of its digits is 1944, while the sum is 29.

The square root of 21963161 is about 4686.4870638891. The cubic root of 21963161 is about 280.0474451914.

The spelling of 21963161 in words is "twenty-one million, nine hundred sixty-three thousand, one hundred sixty-one".