21975401 has 8 divisors (see below), whose sum is σ = 25152960. Its totient is φ = 18807408.

The previous prime is 21975383. The next prime is 21975413. The reversal of 21975401 is 10457912.

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 21975401 - 2¹⁴ = 21959017 is a prime.

It is a super-2 number, since 2×21975401² = 965836498221602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21975601) 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, 3515 + ... + 7503.

It is an arithmetic number, because the mean of its divisors is an integer number (3144120).

Almost surely, 2^21975401 is an apocalyptic number.

It is an amenable number.

21975401 is a deficient number, since it is larger than the sum of its proper divisors (3177559).

21975401 is an equidigital number, since it uses as much as digits as its factorization.

21975401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4783.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 21975401 is about 4687.7927641908. The cubic root of 21975401 is about 280.0994587147.

The spelling of 21975401 in words is "twenty-one million, nine hundred seventy-five thousand, four hundred one".