21969401 has 8 divisors (see below), whose sum is σ = 22507200. Its totient is φ = 21436272.

The previous prime is 21969397. The next prime is 21969403. The reversal of 21969401 is 10496912.

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 21969401 - 2² = 21969397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21969403) 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, 9506 + ... + 11588.

It is an arithmetic number, because the mean of its divisors is an integer number (2813400).

Almost surely, 2^21969401 is an apocalyptic number.

It is an amenable number.

21969401 is a deficient number, since it is larger than the sum of its proper divisors (537799).

21969401 is a wasteful number, since it uses less digits than its factorization.

21969401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 21969401 is about 4687.1527604720. The cubic root of 21969401 is about 280.0739643035.

The spelling of 21969401 in words is "twenty-one million, nine hundred sixty-nine thousand, four hundred one".