21889401 has 8 divisors (see below), whose sum is σ = 29241984. Its totient is φ = 14564880.

The previous prime is 21889393. The next prime is 21889429. The reversal of 21889401 is 10498812.

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

It is not a de Polignac number, because 21889401 - 2³ = 21889393 is a prime.

It is a super-2 number, since 2×21889401² = 958291752277602, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21889001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5121 + ... + 8366.

It is an arithmetic number, because the mean of its divisors is an integer number (3655248).

Almost surely, 2^21889401 is an apocalyptic number.

It is an amenable number.

21889401 is a deficient number, since it is larger than the sum of its proper divisors (7352583).

21889401 is a wasteful number, since it uses less digits than its factorization.

21889401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14031.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 21889401 is about 4678.6110118282. The cubic root of 21889401 is about 279.7335943983.

The spelling of 21889401 in words is "twenty-one million, eight hundred eighty-nine thousand, four hundred one".