21967057 has 8 divisors (see below), whose sum is σ = 25531200. Its totient is φ = 18509424.

The previous prime is 21967037. The next prime is 21967073. The reversal of 21967057 is 75076912.

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

It is a cyclic number.

It is not a de Polignac number, because 21967057 - 2²³ = 13578449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21967037) 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, 26182 + ... + 27007.

It is an arithmetic number, because the mean of its divisors is an integer number (3191400).

Almost surely, 2^21967057 is an apocalyptic number.

It is an amenable number.

21967057 is a deficient number, since it is larger than the sum of its proper divisors (3564143).

21967057 is an equidigital number, since it uses as much as digits as its factorization.

21967057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53255.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 21967057 is about 4686.9027086126. The cubic root of 21967057 is about 280.0640032260.

It can be divided in two parts, 219 and 67057, that added together give a palindrome (67276).

The spelling of 21967057 in words is "twenty-one million, nine hundred sixty-seven thousand, fifty-seven".