21161067 has 4 divisors (see below), whose sum is σ = 28214760. Its totient is φ = 14107376.

The previous prime is 21161059. The next prime is 21161089. The reversal of 21161067 is 76016112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21161067 - 2³ = 21161059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21161017) 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, 3526842 + ... + 3526847.

It is an arithmetic number, because the mean of its divisors is an integer number (7053690).

Almost surely, 2^21161067 is an apocalyptic number.

21161067 is a deficient number, since it is larger than the sum of its proper divisors (7053693).

21161067 is an equidigital number, since it uses as much as digits as its factorization.

21161067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7053692.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21161067 is about 4600.1159767988. The cubic root of 21161067 is about 276.5959737772.

Adding to 21161067 its reverse (76016112), we get a palindrome (97177179).

The spelling of 21161067 in words is "twenty-one million, one hundred sixty-one thousand, sixty-seven".